pre_text: Combined Incentive Plan Information RSU share activity under the 2004 Plan is set forth below: The total intrinsic value of RSUs which vested during the years ended March 31, 2019, 2018 and 2017 was $229.3 million, $146.0 million and $166.1 million, respectively. The aggregate intrinsic value of RSUs outstanding at March 31, 2019 was $522.0 million, calculated based on the closing price of the Company's common stock of $82.96 per share on March 29, 2019. At March 31, 2019, the weighted average remaining expense recognition period was 1.91 years.
table: Number of Shares Weighted Average Grant Date Fair Value
table: Nonvested shares at March 31, 2016 6,307,742 $36.76
table: Granted 1,635,655 51.46
table: Assumed upon acquisition 2,059,524 46.57
table: Forfeited (722,212) 43.58
table: Vested (2,861,253) 38.60
table: Nonvested shares at March 31, 2017 6,419,456 42.06
table: Granted 1,267,536 77.26
table: Forfeited (279,051) 49.65
table: Vested (1,735,501) 38.00
table: Nonvested shares at March 31, 2018 5,672,440 50.79
table: Granted 1,951,408 77.83
table: Assumed upon acquisition 1,805,680 91.70
table: Forfeited (408,242) 73.36
table: Vested (2,729,324) 61.51
table: Nonvested shares at March 31, 2019 6,291,962 $64.81
question: Analyse this data from a financial earnings document. What was the change in the weighted average grant date fair value of nonvested shares between 2016 and 2017?