pre_text: the company granted 1020 performance shares . the vesting of these shares is contingent on meeting stated goals over a performance period . beginning with restricted stock grants in september 2010 , dividends are accrued on restricted class a common stock and restricted stock units and are paid once the restricted stock vests . the following table summarizes restricted stock and performance shares activity for 2010 : number of shares weighted average grant date fair value .
post_text: the total fair value of restricted stock that vested during the years ended december 31 , 2010 , 2009 and 2008 , was $ 10.3 million , $ 6.2 million and $ 2.5 million , respectively . eligible employees may acquire shares of cme group 2019s 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 . compensation expense is recognized on the dates of purchase for the discount from the closing price . in 2010 , 2009 and 2008 , a total of 4371 , 4402 and 5600 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 $ 0.1 million for the purchase discount was recognized in 2010 , 2009 and 2008 , respectively . non-executive directors receive an annual award of class a common stock with a value equal to $ 75000 . non-executive directors may also elect to receive some or all of the cash portion of their annual stipend , up to $ 25000 , in shares of stock based on the closing price at the date of distribution . as a result , 7470 , 11674 and 5509 shares of class a common stock were issued to non-executive directors during 2010 , 2009 and 2008 , respectively . these shares are not subject to any vesting restrictions . expense of $ 2.4 million , $ 2.5 million and $ 2.4 million related to these stock-based payments was recognized for the years ended december 31 , 2010 , 2009 and 2008 , respectively. .
table: Number of Shares Weighted Average Grant Date Fair Value
table: Outstanding at December 31, 2009 116,677 $280
table: Granted 134,245 275
table: Vested (34,630) 257
table: Cancelled (19,830) 260
table: Outstanding at December 31, 2010 196,462 283
question: Analyse this data from a financial earnings document. considering the weighted average grant date fair value , whats is the difference between how many actual shares vested during the year of 2010 and how many vested based on the average grant fair value?