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.


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 . <table class='wikitable'><tr><td>1</td><td>-</td><td>number of shares</td><td>weighted average grant date fair value</td></tr><tr><td>2</td><td>outstanding at december 31 2009</td><td>116677</td><td>$ 280</td></tr><tr><td>3</td><td>granted</td><td>134245</td><td>275</td></tr><tr><td>4</td><td>vested</td><td>-34630 ( 34630 )</td><td>257</td></tr><tr><td>5</td><td>cancelled</td><td>-19830 ( 19830 )</td><td>260</td></tr><tr><td>6</td><td>outstanding at december 31 2010</td><td>196462</td><td>283</td></tr></table> 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. .
Question: what was the total fair value of restricted stock that vested in 2010, in dollars?
Answer: 10300000.0
Question: and what was the total number of shares in that process?
Answer: 40077.82101
Question: what was the number of shares that vested based on the average grant fair value in 2010?
Answer: 34630.0
Question: and what is, then, the difference between the number of actual shares that vested in that year and the one of shares that vested based on the average grant fair value?

5447.82101