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 .

Question: Analyse this data from a financial earnings document. what was the percentage chaning in the total fair value of restricted stock and performance awards vested from 2016 to 2017?
Choices:
-6.3
13.7
0.685
0.815
0.797
Correct choice index: 2