Note 11 – Stock-Based Compensation During 2014, 2013 and 2012, we recorded non-cash stock-based compensation expense totaling $164 million, $189 million and $167 million, which is included as a component of other unallocated, net on our Statements of Earnings.
The net impact to earnings for the respective years was $107 million, $122 million and $108 million.
As of December 31, 2014, we had $91 million of unrecognized compensation cost related to nonvested awards, which is expected to be recognized over a weighted average period of 1.6 years.
We received cash from the exercise of stock options totaling $308 million, $827 million and $440 million during 2014, 2013 and 2012.
In addition, our income tax liabilities for 2014, 2013 and 2012 were reduced by $215 million, $158 million, $96 million due to recognized tax benefits on stock-based compensation arrangements.
Stock-Based Compensation Plans Under plans approved by our stockholders, we are authorized to grant key employees stock-based incentive awards, including options to purchase common stock, stock appreciation rights, restricted stock units (RSUs), performance stock units (PSUs) or other stock units.
The exercise price of options to purchase common stock may not be less than the fair market value of our stock on the date of grant.
No award of stock options may become fully vested prior to the third anniversary of the grant and no portion of a stock option grant may become vested in less than one year.
The minimum vesting period for restricted stock or stock units payable in stock is three years.
Award agreements may provide for shorter or pro-rated vesting periods or vesting following termination of employment in the case of death, disability, divestiture, retirement, change of control or layoff.
The maximum term of a stock option or any other award is 10 years.
At December 31, 2014, inclusive of the shares reserved for outstanding stock options, RSUs and PSUs, we had 19 million shares reserved for issuance under the plans.
At December 31, 2014, 7.8 million of the shares reserved for issuance remained available for grant under our stock-based compensation plans.
We issue new shares upon the exercise of stock options or when restrictions on RSUs and PSUs have been satisfied.
RSUs The following table summarizes activity related to nonvested RSUs during 2014:
## Table 0 ##
RSUs are valued based on the fair value of our common stock on the date of grant.
Employees who are granted RSUs receive the right to receive shares of stock after completion of the vesting period; however, the shares are not issued and the employees cannot sell or transfer shares prior to vesting and have no voting rights until the RSUs vest, generally three years from the date of the award.
Employees who are granted RSUs receive dividend-equivalent cash payments only upon vesting.
For these RSU awards, the grant-date fair value is equal to the closing market price of our common stock on the date of grant less a discount to reflect the delay in payment of dividend-equivalent cash payments.
We recognize the grant-date fair value of RSUs, less estimated forfeitures, as compensation expense ratably over the requisite service period, which beginning with the RSUs granted in 2013 is shorter than the vesting period if the employee is retirement eligible on the date of grant or will become retirement eligible before the end of the vesting period.
ITEM 6 SELECTED FINANCIAL DATA The following table summarizes certain selected consolidated financial data for, and as of the end of, each of the fiscal years in the five-year period ended June 30, 2009.
The data set forth below should be read in conjunction with the Management’s Discussion and Analysis of Financial Condition and Results of Operations and our Consolidated Financial Statements and related Notes included elsewhere in this Report.
The consolidated statements of operations data for the years ended June 30, 2009, 2008 and 2007 and the balance sheet data as of June 30, 2009 and 2008 are derived from our audited consolidated financial statements included elsewhere in this Report.
The consolidated statements of operations data for the years ended June 30, 2006 and 2005 and the balance sheet data as of June 30, 2007, 2006 and 2005 are derived from our audited consolidated financial statements not included herein.
Historical results are not necessarily indicative of the results to be expected in the future, and the results for the years presented should not be considered indicative of our future results of operations.
## Table 1 ##
The results of our international operations are affected by changes in exchange rates between currencies.
Changes in exchange rates may negatively affect our consolidated net revenue and gross profit margins from international operations.
We are exposed to the risk that the dollar value equivalent of anticipated cash flows would be adversely affected by changes in foreign currency exchange rates.
We manage this risk through foreign currency option contracts.
Stock-Based Compensation Costs We have granted stock options to personnel, including officers and directors, under our 2006 Incentive Award Plan, as amended (the “2006 Plan”).
These options have expiration dates of seven years from the date of grant and vest over four years.
We granted these options with the exercise price equal to the market value as determined at the date of grant.
We have also offered to our personnel, including officers and directors, the right to purchase shares of our common stock at a discount under our employee stock purchase plan (“ESPP”).
As of July 1, 2005, we adopted SFAS 123(R) using the modified prospective method, which requires measurement of compensation expense of all stock-based awards at fair value on the date of grant and recognition of compensation expense over the service period for awards expected to vest.
Under this method, the provisions of SFAS 123(R) apply to all awards granted or modified after the date of adoption.
In addition, the unrecognized expense of awards not yet vested at the date of adoption, determined under the original provisions of SFAS No.123 shall be recognized in net income in the periods after adoption.
The fair value of stock options is determined using the Black-Scholes valuation model.
Such value is recognized as expense over the service period, using the gradedattribution method for stock-based awards granted prior to July 1, 2005 and the straight-line method for stock-based awards granted after July 1, 2005.
The fair value of stock options granted under our stock option plans and purchase rights granted under our ESPP is estimated on the date of the grant using the Black-Scholes option-pricing model, assuming no dividends and the following assumptions:
## Table 2 ##
Expected volatilities are based on a combination of historical volatilities of our stock and the implied volatilities from tradeable options of our stock corresponding to their expected term.
We use a combination of the historic and implied volatilities as the additional use of the implied volatilities are more representative of our future stock price trends.
The expected life represents the weighted average period of time that options granted are expected to be outstanding giving consideration to vesting schedules and our historical exercise patterns.
The risk-free rate is based on the U. S.  Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option.

Tables referenced above, in order (Table 0 first):
<table><tr><td></td><td>Number of RSUs (In thousands)</td><td>Weighted Average Grant-Date Fair Value PerShare</td></tr><tr><td>Nonvested at December 31, 2011</td><td>4,302</td><td>$ 78.25</td></tr><tr><td>Granted</td><td>1,987</td><td>81.93</td></tr><tr><td>Vested</td><td>-1,299</td><td>80.64</td></tr><tr><td>Forfeited</td><td>-168</td><td>79.03</td></tr><tr><td>Nonvested at December 31, 2012</td><td>4,822</td><td>$ 79.10</td></tr><tr><td>Granted</td><td>1,356</td><td>89.24</td></tr><tr><td>Vested</td><td>-2,093</td><td>79.26</td></tr><tr><td>Forfeited</td><td>-226</td><td>81.74</td></tr><tr><td>Nonvested at December 31, 2013</td><td>3,859</td><td>$ 82.42</td></tr><tr><td>Granted</td><td>745</td><td>146.85</td></tr><tr><td>Vested</td><td>-2,194</td><td>87.66</td></tr><tr><td>Forfeited</td><td>-84</td><td>91.11</td></tr><tr><td>Nonvested at December 31, 2014</td><td>2,326</td><td>$ 97.80</td></tr></table>
<table><tr><td> Consolidated Statement of Income Data:</td><td colspan="5">Years Ended June 30</td></tr><tr><td> (In thousands, except per share data)</td><td>2009</td><td>2008</td><td>2007</td><td>2006</td><td>2005</td></tr><tr><td>Net revenues</td><td>$920,735</td><td>$835,397</td><td>$716,332</td><td>$606,996</td><td>$425,505</td></tr><tr><td>Cost of sales</td><td>366,933</td><td>338,544</td><td>272,140</td><td>230,101</td><td>150,645</td></tr><tr><td>Product recall expenses</td><td>-</td><td>3,103</td><td>59,700</td><td>-</td><td>-</td></tr><tr><td>Gross profit</td><td>553,802</td><td>493,750</td><td>384,492</td><td>376,895</td><td>274,860</td></tr><tr><td>Selling, general and administrative expenses</td><td>289,875</td><td>278,087</td><td>237,326</td><td>200,168</td><td>135,703</td></tr><tr><td>Research and development expenses</td><td>63,056</td><td>60,524</td><td>50,106</td><td>37,216</td><td>30,014</td></tr><tr><td>Donations to research foundations</td><td>3,500</td><td>2,000</td><td>-</td><td>760</td><td>500</td></tr><tr><td>In-process research and development charge</td><td>-</td><td>-</td><td>-</td><td>-</td><td>5,268</td></tr><tr><td>Amortization of acquired intangible assets</td><td>7,060</td><td>7,791</td><td>6,897</td><td>6,327</td><td>870</td></tr><tr><td>Restructuring expenses</td><td>-</td><td>2,378</td><td>-</td><td>1,124</td><td>5,152</td></tr><tr><td>Total operating expenses</td><td>363,491</td><td>350,780</td><td>294,329</td><td>245,595</td><td>177,507</td></tr><tr><td>Income from operations</td><td>190,311</td><td>142,970</td><td>90,163</td><td>131,300</td><td>97,353</td></tr><tr><td>Other income (expenses):</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Interest income (expense), net</td><td>10,205</td><td>10,058</td><td>6,477</td><td>1,320</td><td>-808</td></tr><tr><td>Other, net</td><td>1,168</td><td>4,827</td><td>1,333</td><td>774</td><td>81</td></tr><tr><td>Total other income (expenses)</td><td>11,373</td><td>14,885</td><td>7,810</td><td>2,094</td><td>-727</td></tr><tr><td>Income before income taxes</td><td>201,684</td><td>157,855</td><td>97,973</td><td>133,394</td><td>96,626</td></tr><tr><td>Income taxes</td><td>-55,236</td><td>-47,552</td><td>-31,671</td><td>-45,183</td><td>-31,841</td></tr><tr><td>Net income</td><td>$146,448</td><td>$110,303</td><td>$66,302</td><td>$88,211</td><td>$64,785</td></tr><tr><td>Basic earnings per share</td><td>$1.94</td><td>$1.43</td><td>$0.86</td><td>$1.22</td><td>$0.94</td></tr><tr><td>Diluted earnings per share</td><td>$1.90</td><td>$1.40</td><td>$0.85</td><td>$1.16</td><td>$0.91</td></tr><tr><td>Weighted average:</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Basic shares outstanding</td><td>75,629</td><td>77,378</td><td>76,709</td><td>72,307</td><td>68,643</td></tr><tr><td>Diluted shares outstanding</td><td>77,113</td><td>78,712</td><td>78,253</td><td>77,162</td><td>74,942</td></tr></table>
<table><tr><td></td><td colspan="3"> Years ended June 30</td></tr><tr><td></td><td>2009</td><td> 2008</td><td> 2007</td></tr><tr><td>Stock Options:</td><td></td><td></td><td></td></tr><tr><td>Weighted average grant date fair value</td><td>$10.58</td><td>$12.87</td><td>$14.53</td></tr><tr><td>Weighted average risk-free interest rate</td><td>1.9%</td><td>2.6-4.6%</td><td>4.3-5.1%</td></tr><tr><td>Dividend yield</td><td>-</td><td>-</td><td>-</td></tr><tr><td>Expected option life in years</td><td>4.0-4.8</td><td>4.0-4.8</td><td>4.0-5.2</td></tr><tr><td>Volatility</td><td>27-38%</td><td>27-28%</td><td>26-30%</td></tr><tr><td>ESPP Purchase rights:</td><td></td><td></td><td></td></tr><tr><td>Weighted average risk-free interest rate</td><td>1.3%</td><td>1.7-5.0%</td><td>4.9-5.1%</td></tr><tr><td>Dividend yield</td><td>-</td><td>-</td><td>-</td></tr><tr><td>Expected option life</td><td>6 months</td><td>6 months</td><td>6 months</td></tr><tr><td>Volatility</td><td>33-55%</td><td>23-33%</td><td>30-41%</td></tr></table>

Question: what was the percentage change in non-cash stock-based compensation expense from 2013 to 2014?
Answer: -0.13228
Reasoning program: subtract(164,189), divide(#0,189)