service cost for the DB Pension Plan in 2015.
The estimated period of amortization of these new prior service costs (credits) for CMS Energy and Consumers is ten years.
CMS Energy and Consumers determine the MRV for DB Pension Plan assets as the fair value of plan assets on the measurement date, adjusted by the gains or losses that will not be admitted into the MRV until future years.
CMS Energy and Consumers reflect each year’s gain or loss in the MRV in equal amounts over a five-year period beginning on the date the original amount was determined.
CMS Energy and Consumers determine the MRV for OPEB Plan assets as the fair value of assets on the measurement date.
Reconciliations: Presented in the following table are reconciliations of the funded status of CMS Energy’s and Consumers’ retirement benefits plans with their retirement benefits plans’ liabilities:
## Table 0 ##
The actuarial loss for 2016 was primarily the result of claims, experience, and lowering the discount rates used in calculating the plans’ obligations.
The actuarial gain for 2015 was primarily the result of increasing the discount rates used in calculating the plans’ obligations.
Medtronic plc Notes to Consolidated Financial Statements (Continued) The following table provides the weighted average fair value of options granted to employees and the related assumptions used in the Black-Scholes model:
## Table 1 ##
(1) Expected life: The Company analyzes historical employee stock option exercise and termination data to estimate the expected life assumption.
The Company calculates the expected life assumption using the midpoint scenario, which combines historical exercise data with hypothetical exercise data, as the Company believes this data currently represents the best estimate of the expected life of a new employee option.
The Company also stratifies its employee population into two groups based upon distinctive exercise behavior patterns.
(2) Risk-free interest rate: The rate is based on the grant date yield of a zero-coupon U. S.  Treasury bond whose maturity period equals the expected term of the option.
(3) Volatility: Expected volatility is based on a blend of historical volatility and an implied volatility of the Company’s ordinary shares.
Implied volatility is based on market traded options of the Company’s ordinary shares.
(4) Dividend yield: The dividend yield rate is calculated by dividing the Company’s annual dividend, based on the most recent quarterly dividend rate, by the closing stock price on the grant date.
Stock-Based Compensation Expense Under the fair value recognition provisions of U. S.  GAAP for accounting for stockbased compensation, the Company measures stock-based compensation expense at the grant date based on the fair value of the award and recognizes the compensation expense over the requisite service period, which is generally the vesting period.
The amount of stock-based compensation expense recognized during a period is based on the portion of the awards that are ultimately expected to vest.
The Company estimates pre-vesting forfeitures at the time of grant by analyzing historical data and revises those estimates in subsequent periods if actual forfeitures differ from those estimates.
Ultimately, the total expense recognized over the vesting period will equal the fair value of awards that actually vest.
Pursuant to the Transaction Agreement, outstanding stock option awards held by Covidien employees upon transaction close were converted into options to acquire the Company’s ordinary shares in a manner designed to preserve the intrinsic value of such awards.
In addition, unvested restricted stock units granted on or after June 15, 2014 which were held by Covidien employees upon close of the Covidien acquisition were converted into restricted stock units of the Company in a manner designed to preserve the intrinsic value of such awards.
The modifications made to the restricted stock units granted on or after June 15, 2014 and all outstanding share options pursuant to the Transaction Agreement that converted such awards constituted modifications under the authoritative guidance for accounting for stock compensation.
This guidance requires the Company to revalue the award upon the transaction close and allocate the revised fair value between consideration paid and continuing expense based on the ratio of service performed through the transaction date over the total service period of the award.
The revised fair value allocated to post-combination services resulted in incremental expense which is recognized over the remaining service period of the award.
The Company recognized $58 million of incremental expense related to these modifications during fiscal year 2016 and is included in acquisition-related items.
Except for the conversion of share options and restricted stock units discussed herein, the material terms of these awards remained unchanged.
Five-Year Performance Comparison – The following graph provides an indicator of cumulative total shareholder returns for the Corporation as compared to the peer group index (described above), the DJ Trans, and the S&P 500.
The graph assumes that $100 was invested in the common stock of Union Pacific Corporation and each index on December 31, 2011 and that all dividends were reinvested.
The information below is historical in nature and is not necessarily indicative of future performance.
## Table 2 ##
Purchases of Equity Securities – During 2016, we repurchased 35,686,529 shares of our common stock at an average price of $88.36.
The following table presents common stock repurchases during each month for the fourth quarter of 2016:
[a] Total number of shares purchased during the quarter includes approximately 74,460 shares delivered or attested to UPC by employees to pay stock option exercise prices, satisfy excess tax withholding obligations for stock option exercises or vesting of retention units, and pay withholding obligations for vesting of retention shares.
[b] Effective January 1, 2014, our Board of Directors authorized the repurchase of up to 120 million shares of our common stock by December 31, 2017.
These repurchases may be made on the open market or through other transactions.
Our management has sole discretion with respect to determining the timing and amount of these transactions.
On November 17, 2016, our Board of Directors approved the early renewal of the share repurchase program, authorizing the repurchase of up to 120 million shares of our common stock by December 31, 2020.
The new authorization was effective January 1, 2017, and replaces the previous authorization, which expired on December 31, 2016.

<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td>In Millions</td></tr><tr><td></td><td colspan="2">DB Pension Plan</td><td colspan="2">DB SERP</td><td colspan="2">OPEB Plan</td></tr><tr><td>Years Ended December 31</td><td>2016</td><td>2015</td><td>2016</td><td>2015</td><td>2016</td><td>2015</td></tr><tr><td> CMS Energy, including Consumers</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Benefit obligation at beginning of period</td><td>$2,403</td><td>$2,547</td><td>$150</td><td>$156</td><td>$1,227</td><td>$1,378</td></tr><tr><td>Service cost</td><td>42</td><td>49</td><td>-</td><td>1</td><td>18</td><td>25</td></tr><tr><td>Interest cost</td><td>85</td><td>102</td><td>5</td><td>6</td><td>46</td><td>58</td></tr><tr><td>Plan amendments</td><td>-</td><td>13</td><td>-</td><td>-</td><td>-</td><td>-25</td></tr><tr><td>Actuarial (gain) loss</td><td>1961</td><td>-153 1</td><td>4</td><td>-5</td><td>1711</td><td>-152 1</td></tr><tr><td>Benefits paid</td><td>-164</td><td>-155</td><td>-8</td><td>-8</td><td>-54</td><td>-57</td></tr><tr><td>Benefit obligation at end of period</td><td>$2,562</td><td>$2,403</td><td>$151</td><td>$150</td><td>$1,408</td><td>$1,227</td></tr><tr><td>Plan assets at fair value at beginning of period</td><td>$2,013</td><td>$1,979</td><td>$-</td><td>$-</td><td>$1,208</td><td>$1,265</td></tr><tr><td>Actual return on plan assets</td><td>152</td><td>-36</td><td>-</td><td>-</td><td>109</td><td>-29</td></tr><tr><td>Company contribution</td><td>100</td><td>225</td><td>8</td><td>8</td><td>-</td><td>29</td></tr><tr><td>Actual benefits paid</td><td>-164</td><td>-155</td><td>-8</td><td>-8</td><td>-53</td><td>-57</td></tr><tr><td>Plan assets at fair value at end of period</td><td>$2,101</td><td>$2,013</td><td>$-</td><td>$-</td><td>$1,264</td><td>$1,208</td></tr><tr><td>Funded status</td><td>$-461 2</td><td>$-390 2</td><td>$-151</td><td>$-150</td><td>$-144</td><td>$-19</td></tr><tr><td> Consumers</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Benefit obligation at beginning of period</td><td></td><td></td><td>$106</td><td>$111</td><td>$1,188</td><td>$1,336</td></tr><tr><td>Service cost</td><td></td><td></td><td>-</td><td>1</td><td>17</td><td>25</td></tr><tr><td>Interest cost</td><td></td><td></td><td>4</td><td>4</td><td>45</td><td>56</td></tr><tr><td>Plan amendments</td><td></td><td></td><td>-</td><td>-</td><td>-</td><td>-24</td></tr><tr><td>Actuarial (gain) loss</td><td></td><td></td><td>4</td><td>-5</td><td>1671</td><td>-150 1</td></tr><tr><td>Benefits paid</td><td></td><td></td><td>-5</td><td>-5</td><td>-52</td><td>-55</td></tr><tr><td>Benefit obligation at end of period</td><td></td><td></td><td>$109</td><td>$106</td><td>$1,365</td><td>$1,188</td></tr><tr><td>Plan assets at fair value at beginning of period</td><td></td><td></td><td>$-</td><td>$-</td><td>$1,133</td><td>$1,186</td></tr><tr><td>Actual return on plan assets</td><td></td><td></td><td>-</td><td>-</td><td>103</td><td>-27</td></tr><tr><td>Company contribution</td><td></td><td></td><td>5</td><td>5</td><td>-</td><td>29</td></tr><tr><td>Actual benefits paid</td><td></td><td></td><td>-5</td><td>-5</td><td>-52</td><td>-55</td></tr><tr><td>Plan assets at fair value at end of period</td><td></td><td></td><td>$-</td><td>$-</td><td>$1,184</td><td>$1,133</td></tr><tr><td>Funded status</td><td></td><td></td><td>$-109</td><td>$-106</td><td>$-181</td><td>$-55</td></tr></table>
<table><tr><td></td><td colspan="3">Fiscal Year</td></tr><tr><td></td><td>2016</td><td>2015</td><td>2014</td></tr><tr><td>Weighted average fair value of options granted</td><td>$13.72</td><td>$25.39</td><td>$12.00</td></tr><tr><td>Assumptions used:</td><td></td><td></td><td></td></tr><tr><td>Expected life (years)<sup>(1)</sup></td><td>5.94</td><td>4.24</td><td>6.40</td></tr><tr><td>Risk-free interest rate<sup>-2</sup></td><td>1.79%</td><td>0.99%</td><td>1.88%</td></tr><tr><td>Volatility<sup>-3</sup></td><td>21.00%</td><td>21.29%</td><td>25.20%</td></tr><tr><td>Dividend yield<sup>-4</sup></td><td>1.96%</td><td>1.66%</td><td>2.02%</td></tr></table>
<table><tr><td>Period</td><td>Total Number of Shares Purchased [a]</td><td>Average Price Paid Per Share</td><td>Total Number of Shares Purchased as Part of a Publicly AnnouncedPlan or Program [b]</td><td>Maximum Number of Shares Remaining Under the Plan or Program [b]</td></tr><tr><td>Oct. 1 through Oct. 31</td><td>3,501,308</td><td>$92.89</td><td>3,452,500</td><td>23,769,426</td></tr><tr><td>Nov. 1 through Nov. 30</td><td>2,901,167</td><td>95.68</td><td>2,876,067</td><td>20,893,359</td></tr><tr><td>Dec. 1 through Dec. 31</td><td>3,296,652</td><td>104.30</td><td>3,296,100</td><td>17,597,259</td></tr><tr><td>Total</td><td>9,699,127</td><td>$97.60</td><td>9,624,667</td><td>N/A</td></tr></table>

Question: during 2016 what was the percent of the number of shares bought in the fourth quarter
Answer: 0.27179