shareholder value award program svas are granted to officers and management and are payable in shares of our common stock . the number of shares actually issued , if any , varies depending on our stock price at the end of the three-year vesting period compared to pre-established target stock prices . we measure the fair value of the sva unit on the grant date using a monte carlo simulation model . the model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award . expected volatilities utilized in the model are based on implied volatilities from traded options on our stock , historical volatility of our stock price , and other factors . similarly , the dividend yield is based on historical experience and our estimate of future dividend yields . the risk-free interest rate is derived from the u.s . treasury yield curve in effect at the time of grant . the weighted-average fair values of the sva units granted during the years ended december 31 , 2018 , 2017 , and 2016 were $ 48.51 , $ 66.25 , and $ 48.68 , respectively , determined using the following assumptions: .
what was the percent of the change in the volatility from 2016 to 2017
pursuant to this program , approximately 0.7 million shares , 1.1 million shares , and 1.0 million shares were issued during the years ended december 31 , 2018 , 2017 , and 2016 , respectively . approximately 1.0 million shares are expected to be issued in 2019 . as of december 31 , 2018 , the total remaining unrecognized compensation cost related to nonvested svas was $ 55.7 million , which will be amortized over the weighted-average remaining requisite service period of 20 months . restricted stock units rsus are granted to certain employees and are payable in shares of our common stock . rsu shares are accounted for at fair value based upon the closing stock price on the date of grant . the corresponding expense is amortized over the vesting period , typically three years . the fair values of rsu awards granted during the years ended december 31 , 2018 , 2017 , and 2016 were $ 70.95 , $ 72.47 , and $ 71.46 , respectively . the number of shares ultimately issued for the rsu program remains constant with the exception of forfeitures . pursuant to this program , 1.3 million , 1.4 million , and 1.3 million shares were granted and approximately 1.0 million , 0.9 million , and 0.6 million shares were issued during the years ended december 31 , 2018 , 2017 , and 2016 , respectively . approximately 0.8 million shares are expected to be issued in 2019 . as of december 31 , 2018 , the total remaining unrecognized compensation cost related to nonvested rsus was $ 112.2 million , which will be amortized over the weighted- average remaining requisite service period of 21 months . note 12 : shareholders' equity during 2018 , 2017 , and 2016 , we repurchased $ 4.15 billion , $ 359.8 million and $ 540.1 million , respectively , of shares associated with our share repurchase programs . a payment of $ 60.0 million was made in 2016 for shares repurchased in 2017 . during 2018 , we repurchased $ 2.05 billion of shares , which completed the $ 5.00 billion share repurchase program announced in october 2013 and our board authorized an $ 8.00 billion share repurchase program . there were $ 2.10 billion repurchased under the $ 8.00 billion program in 2018 . as of december 31 , 2018 , there were $ 5.90 billion of shares remaining under the 2018 program . we have 5.0 million authorized shares of preferred stock . as of december 31 , 2018 and 2017 , no preferred stock was issued . we have an employee benefit trust that held 50.0 million shares of our common stock at both december 31 , 2018 and 2017 , to provide a source of funds to assist us in meeting our obligations under various employee benefit plans . the cost basis of the shares held in the trust was $ 3.01 billion at both december 31 , 2018 and 2017 , and is shown as a reduction of shareholders 2019 equity . any dividend transactions between us and the trust are eliminated . stock held by the trust is not considered outstanding in the computation of eps . the assets of the trust were not used to fund any of our obligations under these employee benefit plans during the years ended december 31 , 2018 , 2017 , and .