Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.


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 ) . <table class='wikitable'><tr><td>1</td><td>-</td><td>shares ( in thousands )</td><td>weighted-averagegrant-datefair value</td></tr><tr><td>2</td><td>unvested at may 31 2014</td><td>1754</td><td>$ 22.72</td></tr><tr><td>3</td><td>granted</td><td>954</td><td>36.21</td></tr><tr><td>4</td><td>vested</td><td>-648 ( 648 )</td><td>23.17</td></tr><tr><td>5</td><td>forfeited</td><td>-212 ( 212 )</td><td>27.03</td></tr><tr><td>6</td><td>unvested at may 31 2015</td><td>1848</td><td>28.97</td></tr><tr><td>7</td><td>granted</td><td>461</td><td>57.04</td></tr><tr><td>8</td><td>vested</td><td>-633 ( 633 )</td><td>27.55</td></tr><tr><td>9</td><td>forfeited</td><td>-70 ( 70 )</td><td>34.69</td></tr><tr><td>10</td><td>unvested at may 31 2016</td><td>1606</td><td>37.25</td></tr><tr><td>11</td><td>granted</td><td>348</td><td>74.26</td></tr><tr><td>12</td><td>vested</td><td>-639 ( 639 )</td><td>31.38</td></tr><tr><td>13</td><td>forfeited</td><td>-52 ( 52 )</td><td>45.27</td></tr><tr><td>14</td><td>unvested at december 31 2016</td><td>1263</td><td>49.55</td></tr><tr><td>15</td><td>granted</td><td>899</td><td>79.79</td></tr><tr><td>16</td><td>vested</td><td>-858 ( 858 )</td><td>39.26</td></tr><tr><td>17</td><td>forfeited</td><td>-78 ( 78 )</td><td>59.56</td></tr><tr><td>18</td><td>unvested at december 31 2017</td><td>1226</td><td>$ 78.29</td></tr></table> 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 .
Question: what was the difference in the total fair value of restricted stock and performance awards vested between 2016 and 2017?

13.7