what was the percentage chaning in the total fair value of restricted stock and performance awards vested from 2016 to 2017?
leveraged performance units during the year ended may 31 , 2015 , certain executives were granted performance units that we refer to as 201cleveraged performance units , 201d or 201clpus . 201d lpus contain a market condition based on our relative stock price growth over a three-year performance period . the lpus contain a minimum threshold performance which , if not met , would result in no payout . the lpus also contain a maximum award opportunity set as a fixed dollar and fixed number of shares . after the three-year performance period , which concluded in october 2017 , one-third of the earned units converted to unrestricted common stock . the remaining two-thirds converted to restricted stock that will vest in equal installments on each of the first two anniversaries of the conversion date . we recognize share-based compensation expense based on the grant date fair value of the lpus , as determined by use of a monte carlo model , on a straight-line basis over the requisite service period for each separately vesting portion of the lpu award . the following table summarizes the changes in unvested restricted stock and performance awards for the year ended december 31 , 2017 , the 2016 fiscal transition period and for the years ended may 31 , 2016 and 2015 : shares weighted-average grant-date fair value ( in thousands ) .

|  | Shares (in thousands) | Weighted-AverageGrant-DateFair Value |
| :--- | :--- | :--- |
| Unvested at May 31, 2014 | 1,754 | $22.72 |
| Granted | 954 | 36.21 |
| Vested | (648) | 23.17 |
| Forfeited | (212) | 27.03 |
| Unvested at May 31, 2015 | 1,848 | 28.97 |
| Granted | 461 | 57.04 |
| Vested | (633) | 27.55 |
| Forfeited | (70) | 34.69 |
| Unvested at May 31, 2016 | 1,606 | 37.25 |
| Granted | 348 | 74.26 |
| Vested | (639) | 31.38 |
| Forfeited | (52) | 45.27 |
| Unvested at December 31, 2016 | 1,263 | 49.55 |
| Granted | 899 | 79.79 |
| Vested | (858) | 39.26 |
| Forfeited | (78) | 59.56 |
| Unvested at December 31, 2017 | 1,226 | $78.29 |

the total fair value of restricted stock and performance awards vested was $ 33.7 million for the year ended december 31 , 2017 , $ 20.0 million for the 2016 fiscal transition period and $ 17.4 million and $ 15.0 million , respectively , for the years ended may 31 , 2016 and 2015 . for restricted stock and performance awards , we recognized compensation expense of $ 35.2 million for the year ended december 31 , 2017 , $ 17.2 million for the 2016 fiscal transition period and $ 28.8 million and $ 19.8 million , respectively , for the years ended may 31 , 2016 and 2015 . as of december 31 , 2017 , there was $ 46.1 million of unrecognized compensation expense related to unvested restricted stock and performance awards that we expect to recognize over a weighted-average period of 1.8 years . our restricted stock and performance award plans provide for accelerated vesting under certain conditions . stock options stock options are granted with an exercise price equal to 100% ( 100 % ) of fair market value of our common stock on the date of grant and have a term of ten years . stock options granted before the year ended may 31 , 2015 vest in equal installments on each of the first four anniversaries of the grant date . stock options granted during the year ended may 31 , 2015 and thereafter vest in equal installments on each of the first three anniversaries of the grant date . our stock option plans provide for accelerated vesting under certain conditions . global payments inc . | 2017 form 10-k annual report 2013 91 .

vested_restricted_stock = 33.7
grant_date_fair_value = 20.0
percent_change = (vested_restricted_stock - grant_date_fair_value) / grant_date_fair_value
answer = percent_change * 100