{"pre_text": ["the weighted average grant date fair value of options granted during 2012 , 2011 , and 2010 was $ 13 , $ 19 and $ 20 per share , respectively .", "the total intrinsic value of options exercised during the years ended december 31 , 2012 , 2011 and 2010 , was $ 19.0 million , $ 4.2 million and $ 15.6 million , respectively .", "in 2012 , the company granted 931340 shares of restricted class a common stock and 4048 shares of restricted stock units .", "restricted common stock and restricted stock units generally have a vesting period of 2 to 4 years .", "the fair value related to these grants was $ 54.5 million , which is recognized as compensation expense on an accelerated basis over the vesting 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 .", "in 2012 , the company also granted 138410 performance shares .", "the fair value related to these grants was $ 7.7 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 2012 : number of shares weighted average grant date fair value outstanding at december 31 , 2011 .", ".", ".", ".", ".", ".", ".", ".", ".", ".", ".", ".", ".", ".", "1432610 $ 57 ."], "post_text": ["outstanding at december 31 , 2012 .", ".", ".", ".", ".", ".", ".", ".", ".", ".", ".", ".", ".", ".", "1913527 54 the total fair value of restricted stock , restricted stock units , and performance shares that vested during the years ended december 31 , 2012 , 2011 and 2010 , was $ 20.9 million , $ 11.6 million and $ 10.3 million , respectively .", "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 2012 , 2011 and 2010 , a total of 27768 , 32085 and 21855 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 , $ 0.2 million and $ 0.1 million for the purchase discount was recognized in 2012 , 2011 and 2010 , 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 , 40260 , 40585 and 37350 shares of class a common stock were issued to non-executive directors during 2012 , 2011 and 2010 , respectively .", "these shares are not subject to any vesting restrictions .", "expense of $ 2.2 million , $ 2.1 million and $ 2.4 million related to these stock-based payments was recognized for the years ended december 31 , 2012 , 2011 and 2010 , respectively .", "19 .", "fair value measurements in general , the company uses quoted prices in active markets for identical assets to determine the fair value of marketable securities and equity investments .", "level 1 assets generally include u.s .", "treasury securities , equity securities listed in active markets , and investments in publicly traded mutual funds with quoted market prices .", "if quoted prices are not available to determine fair value , the company uses other inputs that are directly observable .", "assets included in level 2 generally consist of asset- backed securities , municipal bonds , u.s .", "government agency securities and interest rate swap contracts .", "asset-backed securities , municipal bonds and u.s .", "government agency securities were measured at fair value based on matrix pricing using prices of similar securities with similar inputs such as maturity dates , interest rates and credit ratings .", "the company determined the fair value of its interest rate swap contracts using standard valuation models with market-based observable inputs including forward and spot exchange rates and interest rate curves. ."], "table": [["", "number of shares", "weightedaveragegrant datefair value"], ["outstanding at december 31 2011", "1432610", "$ 57"], ["granted", "1073798", "54"], ["vested", "-366388 ( 366388 )", "55"], ["cancelled", "-226493 ( 226493 )", "63"], ["outstanding at december 31 2012", "1913527", "54"]], "table_ori": [["", "Number of Shares", "WeightedAverageGrant DateFair Value"], ["Outstanding at December 31, 2011", "1,432,610", "$57"], ["Granted", "1,073,798", "54"], ["Vested", "(366,388)", "55"], ["Cancelled", "(226,493)", "63"], ["Outstanding at December 31, 2012", "1,913,527", "54"]]}

Question: what was the average number of shares of class a common stock were issued to non-executive between 2010 and 2012
Evidence:
text_47: as a result , 40260 , 40585 and 37350 shares of class a common stock were issued to non-executive directors during 2012 , 2011 and 2010 , respectively .
Program: add(40260, 40585), add(#0, 37350), add(#1, const_3), divide(#2, const_2)
Answer:
str_answer: 39398.33
exe_answer: 59099