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.


in 2017 , the company granted 440076 shares of restricted class a common stock and 7568 shares of restricted stock units . restricted common stock and restricted stock units generally have a vesting period of two to four years . the fair value related to these grants was $ 58.7 million , which is recognized as compensation expense on an accelerated basis over the vesting period . dividends are accrued on restricted class a common stock and restricted stock units and are paid once the restricted stock vests . in 2017 , the company also granted 203298 performance shares . the fair value related to these grants was $ 25.3 million , which is recognized as compensation expense on an accelerated and straight-lined basis over the vesting period . the vesting of these shares is contingent on meeting stated performance or market conditions . the following table summarizes restricted stock , restricted stock units , and performance shares activity for 2017 : number of shares weighted average grant date fair value . <table class='wikitable'><tr><td>1</td><td>-</td><td>number of shares</td><td>weightedaveragegrant datefair value</td></tr><tr><td>2</td><td>outstanding at december 31 2016</td><td>1820578</td><td>$ 98</td></tr><tr><td>3</td><td>granted</td><td>650942</td><td>129</td></tr><tr><td>4</td><td>vested</td><td>-510590 ( 510590 )</td><td>87</td></tr><tr><td>5</td><td>cancelled</td><td>-401699 ( 401699 )</td><td>95</td></tr><tr><td>6</td><td>outstanding at december 31 2017</td><td>1559231</td><td>116</td></tr></table> the total fair value of restricted stock , restricted stock units , and performance shares that vested during 2017 , 2016 and 2015 was $ 66.0 million , $ 59.8 million and $ 43.3 million , respectively . under the espp , eligible employees may acquire shares of class a common stock using after-tax payroll deductions made during consecutive offering periods of approximately six months in duration . shares are purchased at the end of each offering period at a price of 90% ( 90 % ) of the closing price of the class a common stock as reported on the nasdaq global select market . compensation expense is recognized on the dates of purchase for the discount from the closing price . in 2017 , 2016 and 2015 , a total of 19936 , 19858 and 19756 shares , respectively , of class a common stock were issued to participating employees . these shares are subject to a six-month holding period . annual expense of $ 0.3 million for the purchase discount was recognized in 2017 , and $ 0.2 million was recognized in both 2016 and 2015 . non-executive directors receive an annual award of class a common stock with a value equal to $ 100000 . non-executive directors may also elect to receive some or all of the cash portion of their annual stipend , up to $ 60000 , in shares of stock based on the closing price at the date of distribution . as a result , 19736 shares , 26439 shares and 25853 shares of class a common stock were issued to non-executive directors during 2017 , 2016 and 2015 , respectively . these shares are not subject to any vesting restrictions . expense of $ 2.5 million , $ 2.4 million and $ 2.5 million related to these stock-based payments was recognized for the years ended december 31 , 2017 , 2016 and 2015 , respectively. .
Question: in 2017, what was the number of granted performance shares?
Answer: 203298.0
Question: and what was the total number of granted shares?
Answer: 650942.0
Question: what percentage, then, of this total did that performance shares number represent?

0.31231