{"pre_text": ["leveraged performance units during fiscal 2015 , certain executives were granted performance units that we refer to as leveraged performance units , or lpus .", "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 , one-third of any earned units converts to unrestricted common stock .", "the remaining two-thirds convert 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 .", "total shareholder return units before fiscal 2015 , certain of our executives were granted total shareholder return ( 201ctsr 201d ) units , which are performance-based restricted stock units that are earned based on our total shareholder return over a three-year performance period compared to companies in the s&p 500 .", "once the performance results are certified , tsr units convert into unrestricted common stock .", "depending on our performance , the grantee may earn up to 200% ( 200 % ) of the target number of shares .", "the target number of tsr units for each executive is set by the compensation committee .", "we recognize share-based compensation expense based on the grant date fair value of the tsr units , as determined by use of a monte carlo model , on a straight-line basis over the vesting period .", "the following table summarizes the changes in unvested share-based awards for the years ended may 31 , 2016 and 2015 ( shares in thousands ) : shares weighted-average grant-date fair value ."], "post_text": ["including the restricted stock , performance units and tsr units described above , the total fair value of share- based awards vested during the years ended may 31 , 2016 , 2015 and 2014 was $ 17.4 million , $ 15.0 million and $ 28.7 million , respectively .", "for these share-based awards , we recognized compensation expense of $ 28.8 million , $ 19.8 million and $ 28.2 million in the years ended may 31 , 2016 , 2015 and 2014 , respectively .", "as of may 31 , 2016 , there was $ 42.6 million of unrecognized compensation expense related to unvested share-based awards that we expect to recognize over a weighted-average period of 1.9 years .", "our share-based award plans provide for accelerated vesting under certain conditions .", "employee stock purchase plan we have an employee stock purchase plan under which the sale of 4.8 million shares of our common stock has been authorized .", "employees may designate up to the lesser of $ 25000 or 20% ( 20 % ) of their annual compensation for the purchase of our common stock .", "the price for shares purchased under the plan is 85% ( 85 % ) of the market value on 84 2013 global payments inc .", "| 2016 form 10-k annual report ."], "table": [["", "shares", "weighted-averagegrant-datefair value"], ["unvested at may 31 2014", "1754", "$ 22.72"], ["granted", "954", "36.21"], ["vested", "-648 ( 648 )", "23.17"], ["forfeited", "-212 ( 212 )", "27.03"], ["unvested at may 31 2015", "1848", "28.97"], ["granted", "461", "57.04"], ["vested", "-633 ( 633 )", "27.55"], ["forfeited", "-70 ( 70 )", "34.69"], ["unvested at may 31 2016", "1606", "$ 37.25"]], "table_ori": [["", "Shares", "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"]]}

Question: what was the change in value of unvested grants from 2014 to 2016?
Evidence:
table_1: the unvested at may 31 2014 of shares is 1754 ; the unvested at may 31 2014 of weighted-averagegrant-datefair value is $ 22.72 ;
table_9: the unvested at may 31 2016 of shares is 1606 ; the unvested at may 31 2016 of weighted-averagegrant-datefair value is $ 37.25 ;
text_12: the following table summarizes the changes in unvested share-based awards for the years ended may 31 , 2016 and 2015 ( shares in thousands ) : shares weighted-average grant-date fair value .
Program: multiply(1606, 37.25), multiply(1754, 22.72), subtract(#0, #1)
Answer:
str_answer: increase of $ 19972.62
exe_answer: 19972.62