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| 1. | DEFINITIONS |
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| (i) | the Participant has ceased to be a director of the Corporation by reason of his or her death or retirement or loss of office as a director; and |
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| (ii) | person related to the Corporation for the purposes of the Income Tax Act (Canada). |
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| 2. | ADMINISTRATION |
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| 2.1 | This DSUP shall be administered by the Board, which may delegate its duties and powers in whole or in part to any subcommittee thereof consisting solely of non-employee directors. The Board is authorized to interpret this DSUP, to establish, amend and rescind any rules and regulations relating to this DSUP, and to make any other determinations that it deems necessary or desirable for the administration of this DSUP. The Board may correct any defect or supply any omission or reconcile any inconsistency in this DSUP in the manner and to the extent the Board deems necessary or desirable. Any decision of the Board in the interpretation and administration of this DSUP, as described herein, shall lie within its sole and absolute discretion and shall be final, conclusive and binding on all parties concerned. Notwithstanding the foregoing, all actions of the Board shall be such that this DSUP continuously meets the conditions of paragraph 6801(d) of the Regulations under the Income Tax Act (Canada). Neither the Board or any member thereof, nor any officer or employee of the Corporation, shall be liable for any act, omission, interpretation, construction or determination made in good faith in connection with this DSUP, and the members of the Board and the officers and employees of the Corporation shall be entitled to indemnification by the Corporation in respect of any claim, loss, damage or expense (including legal fees and disbursements) arising therefrom to the fullest extent permitted by law. The expenses of administering this DSUP shall be borne by the Corporation. |
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| 3. | ELIGIBILITY |
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| 3.1 | The Corporation is establishing a DSUP for Directors beginning from the date of the approval by the shareholders of the Corporation. |
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|  | 3.2 | Each Participant is entitled to receive in the form of units a percentage of the annual board retainer fee payable annually to a Director and may, subject to the conditions set forth herein, elect to receive in the form of Units any percentage, up to 100%, of the annual board retainer fee (the "Portion"). |
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| 4. | ELECTION TO PARTICIPATE |
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| 4.1 | Each Participant who elects to participate in the DSUP will be required to file a notice of election, in the form of Schedule A hereto (the "Election Notice"), with the Corporation's Secretary before August 1st in each year and for each new Director such Election Notice must be delivered not later than 7 days after the date on which his or her term as a director commenced, indicating the percentage of the Portion payable |
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| (a) | in the following calendar year for a continuing director and |
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| (b) | in the current calendar year beginning on the first day of the financial quarter of the Corporation next following the date of receipt by the Corporation of the Election Notice for a new director in respect of which the Participant elects to receive Units. |
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| 4.2 | The election of a Participant (who has not filed a Termination Notice in respect of such election) to participate in the DSUP shall be effective for the fiscal year or balance thereof in respect of which it is made and shall be deemed to apply to all fiscal years of the Corporation subsequent to the filing of the Election Notice until and unless a Termination Notice is filed per Section 4.3. If no Election Notice is made, and no prior election is deemed effective, the Participant shall be deemed to have elected to be paid 100% of the Portion in Units. |
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| 4.3 | Each Participant is entitled, at any time, to terminate such Participant's future participation in the DSUP by filing with the Secretary of the Corporation a notice of termination in the form of Schedule B hereto (the "Termination Notice"). A Participant who has filed a Termination Notice may elect to participate again in the DSUP in respect of any period following the filing of such Termination Notice by filing an Election Notice in accordance with Section 4.1, and so on. |
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| 5. | GRANT OF UNITS |
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| 5.1 | Participants will be credited for each fiscal year of the Corporation, a number of Units determined on the basis of the amount of Deferred Remuneration payable to such Director in respect of such fiscal year, divided by the Value of a Unit. |
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| 5.2 | Participants to whose accounts Units stand credited will be credited with additional Units whenever cash dividends are paid on Shares. |
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| 5.3 | In the event of a stock dividend, stock split, combination or exchange of shares, merger, consolidation, spin-off or other distribution (other than normal cash dividends) of the Corporation's assets to shareholders, or any other change affecting the Shares, including the conversion thereof into shares of another entity upon an amalgamation or reorganization of the Corporation, such proportionate adjustments, if any, as the Board in its discretion may deem appropriate to reflect such change, will be made with respect to the number of Units outstanding under the DSUP. |
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| 6. | REDEMPTION OF UNITS |
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| 6.1 | Subject to the limitations contained in sections 6.2 to 6.4, Units will be redeemable and the value thereof payable after the Termination Date of a Participant. |
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| 6.2 | In the case where a Participant ceases to act as a Director, the Participant (or in the case of death, the beneficiary of the Units) may, after the Termination Date, subject to section 6.3, cause the Corporation to redeem the Units by filing a notice of redemption in the form of Schedule C hereto (the "Redemption Notice") with the Corporation's Secretary specifying the redemption date, which shall be at least five Business Days following the date on which the Redemption Notice is filed with the Corporation, but no later than December 15 of the first calendar year commencing after the year of the Termination Date (the "Redemption Date"). |
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| (a) | a number of Shares purchased on the open market by the Broker having a Value of the Units, net of any applicable withholdings, equal to the Value of a Unit on the Redemption Date multiplied by the number of Units credited to his or her notional account on the Payment Date, in accordance with the terms of Section 7 hereof, |
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| (b) | a number of Shares issued by the Corporation equal to the number of Units credited to his or her notional account on the Payment Date, |
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| (c) | any combination of clauses (a) and (b). |
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| 6.3 | If the Participant or his/her beneficiary or legal representative, as the case may be, fails to file a Redemption Notice with the Corporation before the Deadline, the Participant or his/her beneficiary or legal representative, shall be deemed to have filed on the Deadline a Redemption Notice with the Corporation for such Participant's Units specifying December 15 of such year as the Redemption Date. |
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| 6.4 | If a Participant dies after ceasing to act as a Director, but before filing a Redemption Notice with the Corporation, sections 6.2 and 6.3 shall apply with such modifications as the circumstances require. |
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| 6.5 | A Redemption Notice shall apply to all Units held by the Participant or his/her beneficiary or legal representative, as the case may be, at the time it is filed. |
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| 6.6 | Purchase of Shares pursuant to Section 6 hereof shall be made on the open market by a broker independent from the Corporation and who is a member of The Toronto Stock Exchange or NASDAQ Global Select Market or if the Shares are no longer listed or traded on The Toronto Stock Exchange or NASDAQ Global Select Market or both, then of such other stock exchange or quotation service as the Board may determine constitutes the principal market for the Shares (the "Broker"). Any such designation may be changed from time to time. Upon designation of a broker or at any time thereafter, the Corporation may elect to provide the Broker with a letter of agreement to be executed by the Broker and entered into with the Participant and to which the Corporation would also be a party, setting forth, inter alia, (i) the Broker's concurrence to being so designated, to acting for the Participant's account in accordance with customary usage of the trade with a view to obtaining the best share price for the Participant and to delivering to the Participant or his or her representative the share certificate for the Shares purchased upon payment by the Corporation of the purchase price and the related reasonable brokerage commissions, and (ii) the Corporation's agreement to notify the Broker of the number of Shares to be purchased and to pay the purchase price and the related reasonable brokerage commissions, provided however that no terms of such letter agreement shall have the effect of making the Broker or deeming the broker to be an affiliate of (or not independent from) the Corporation for purposes of any applicable corporate, securities or stock exchange requirement. |
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| 6.7 | Prior to 11:00 a.m. (Montreal time) on the Payment Date, the Corporation shall notify the Broker as to the number of Shares to be purchased by the Broker on behalf of the Participant on the open market. As soon as practicable thereafter, the Broker shall purchase on the open market the number of Shares which the Corporation has requested the Broker to purchase and shall notify the Participant and the Corporation of (a) the aggregate purchase price ("Aggregate Purchase Price") of the Shares, (b) the purchase price per Share or, if the Shares were purchased at different prices, the average purchase price (computed on a weighted average basis) per Share, (c) the amount of any related reasonable brokerage commissions and (d) the settlement date for the purchase of the Shares. On the settlement date, upon payment of the Aggregate Purchase Price and related reasonable commissions by the Corporation, the Broker shall deliver to the Participant or to his or her representative the certificate representing the Shares. No settlement date shall be after the last business day in December of the first calendar year commencing after the Termination Date. |
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| 6.8 | The Units, that may be delivered under this DSUP, have not been registered under the U.S. Securities Act of 1933, as amended, as of the effective date of this DSUP and the Corporation has no obligation to register such units. |
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| 7. | SHARES SUBJECT TO THIS DEFERRED SHARE UNIT PLAN |
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| 7.1 | The total number of Shares that may be issued under this DSUP shall not exceed 11,792,893 Shares of the Corporation, including such Shares that may be issued under the Long Term Incentive Plan of the Corporation, subject to the adjustment under Section 8, and no Participant shall hold in total Options, RSUs and Units which may be exercised, settled or redeemed for more than 5% of the number of Shares issued and outstanding from time to time. |
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|  | (i) | the number of Shares reserved for issuance pursuant to Options, RSUs and Units granted to insiders of the Corporation shall not exceed 10% of the total issued and outstanding Shares; |
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|  | (ii) | the number of Shares issued to insiders, within a one-year period, pursuant to the exercise, settlement or redemption of Options, RSUs and Units shall not exceed 10% of the total issued and outstanding Shares; and |
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|  | (iii) | the number of Shares issued to any one insider and such insider's associates, within a one-year period, pursuant to the exercise, settlement or redemption of Options, RSUs and Units shall not exceed 5% of the total issued and outstanding Shares. |
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| 8. | ADJUSTMENTS AND REORGANIZATIONS |
|----|---------------------------------|

| 8.1 | In the event of any change in the number of outstanding Shares of the Corporation by reason of any stock dividend, stock split, recapitalization, merger, consolidation, combination or exchange of Shares or other similar change, subject to the prior approval of the competent regulatory authorities, an equitable adjustment shall be made by the Board in the maximum number or kind of Shares issuable under this DSUP. Such adjustment will be definitive and mandatory for the purposes of this DSUP. |
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| 9. | AMENDMENT OR TERMINATION OF THE DSUP |
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| 9.1 | The Board bears full responsibility with regard to the DSUP, which includes, but is not limited to, the power and authority to amend, suspend or terminate the DSUP, in whole or in part, or amend the terms and conditions of outstanding Units, provided that such amendment, suspension or termination shall: |
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| 9.1.1 | be subject to obtaining approval of the shareholders of the Corporation, unless not required pursuant to section 9.2 or applicable securities law or stock exchange requirements; |
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| 9.1.2 | be subject to obtaining any required approval of any securities regulatory authority or stock exchange; and |
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| 9.1.3 | not adversely alter or impair any Unit previously granted (provided that the Board may at its discretion accelerate the redemption of any Unit regardless of any adverse or potentially adverse tax consequences resulting from such acceleration). |
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| 9.2 | Subject to section 9.3, shareholder approval is not required with respect to the following actions, provided that they are made in accordance with applicable securities law and stock exchange requirements: |
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| 9.2.1 | amendments of a general housekeeping or clerical nature that, among others, clarify, correct or rectify any ambiguity, defective provision, error or omission in the DSUP; |
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| 9.2.2 | amendments necessary to comply with applicable laws or the requirements of any securities regulatory authority or stock exchange; |
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| 9.2.3 | changing the eligibility for, and limitations on, participation in the DSUP; |
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| 9.2.4 | modifying the terms and conditions, including restrictions, not inconsistent with the terms of the DSUP, of any Unit, which terms and conditions may differ among individual Unit grants and Participants; |
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| 9.2.5 | amendments with respect to the term or with respect to circumstances that would accelerate the redemption of Units; |
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| 9.2.6 | any amendment resulting from or due to the alteration of share capital as more fully set out in section 8 hereof; |
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| 9.2.7 | amendments to the provisions relating to the administration of the DSUP; and |
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| 9.2.8 | suspending or terminating the DSUP. |
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| 9.3 | Notwithstanding section 9.2, shareholder approval is required for: |
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| 9.3.1 | any amendment to remove or to exceed the limit in sections 7.1(i) and 7.1(ii); |
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| 9.3.2 | an increase to the maximum number of Shares issuable under the DSUP; and |
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| 9.3.3 | any amendment to the provisions of this Section 9. |
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| 9.4 | With regard to shareholder approval as required pursuant to section 9.3, the votes attached to Shares held directly or indirectly by insiders benefiting directly or indirectly from the amendment must be excluded. |
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| 9.5 | With regard to shareholder approval as required pursuant to section 9.3.5, where the amendment will disproportionately benefit one or more insiders over other Participants, the votes attached to shares held directly or indirectly by those insiders receiving the disproportionate benefit must be excluded. |
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| 10. | GENERAL |
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| 10.1 | The DSUP will be administered by the Board or, if determined by the Board, by a committee of the Board, and all costs related to the implementation and administration of the DSUP will be paid by the Corporation. |
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| 10.2 | A Participant may not sell, assign or otherwise dispose of Units or any rights in respect thereof, except by will or other testamentary document or according to the laws respecting the devolution and allotment of estates. |
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| 10.3 | Unless otherwise determined by the Board, no funds will be set aside to guarantee the payment of the Units and future payment of Units will remain an unfunded liability recorded on the books of the Corporation. |
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| 10.4 | The DSUP will be effective as of January 12, 2005, as amended as of January 10, 2018. |
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|     Note:  All capitalized terms not otherwise defined herein shall have the meaning ascribed thereto in the Deferred Share Unit Plan.  |
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| £ | I hereby elect to participate in the Corporation's Deferred Share Unit Plan and my elected percentage is                %. |
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| £ | I hereby elect not to participate in the Corporation's Deferred Share Unit Plan. |
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| Date   |   | (Signature of Participant)      |   |
|--------|--------|----------------------------------------------------------|--------|
|   |   | (Name of Participant in Block Letters)                   |

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|     Note:  All capitalized terms not otherwise defined herein shall have the meaning ascribed thereto in the Deferred Share Unit Plan.     |
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| Date   |   | (Signature of Participant)      |   |
|--------|--------|----------------------------------------------------------|--------|
|   |   | (Name of Participant in Block Letters)                   |

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|     Note:  All capitalized terms not otherwise defined herein shall have the meaning ascribed thereto in the Deferred Share Unit Plan.  |
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| Date   |   | (Signature of Participant)      |   |
|--------|--------|----------------------------------------------------------|--------|
|   |   | (Name of Participant in Block Letters)                   |