{"pre_text": ["five-year performance comparison 2013 the following graph provides an indicator of cumulative total shareholder returns for the corporation as compared to the peer group index ( described above ) , the dow jones , and the s&p 500 .", "the graph assumes that the value of the investment in the common stock of union pacific corporation and each index was $ 100 on december 31 , 2005 and that all dividends were reinvested .", "purchases of equity securities 2013 during 2010 , we repurchased 17556522 shares of our common stock at an average price of $ 75.51 .", "the following table presents common stock repurchases during each month for the fourth quarter of 2010 : period total number of shares purchased [a] average price paid per share total number of shares purchased as part of a publicly announced plan or program [b] maximum number of shares that may yet be purchased under the plan or program [b] ."], "post_text": ["[a] total number of shares purchased during the quarter includes approximately 563220 shares delivered or attested to upc by employees to pay stock option exercise prices , satisfy excess tax withholding obligations for stock option exercises or vesting of retention units , and pay withholding obligations for vesting of retention shares .", "[b] on may 1 , 2008 , our board of directors authorized us to repurchase up to 40 million shares of our common stock through march 31 , 2011 .", "we may make these repurchases on the open market or through other transactions .", "our management has sole discretion with respect to determining the timing and amount of these transactions .", "on february 3 , 2011 , our board of directors authorized us to repurchase up to 40 million additional shares of our common stock under a new program effective from april 1 , 2011 through march 31 , 2014. ."], "table": [["period", "total number ofsharespurchased [a]", "averageprice paidper share", "total number of sharespurchased as part of apublicly announced planor program [b]", "maximum number ofshares that may yetbe purchased under the planor program [b]"], ["oct . 1 through oct . 31", "725450", "84.65", "519554", "17917736"], ["nov . 1 through nov . 30", "1205260", "89.92", "1106042", "16811694"], ["dec . 1 through dec . 31", "1133106", "92.59", "875000", "15936694"], ["total", "3063816", "$ 89.66", "2500596", "n/a"]], "table_ori": [["<i>Period</i>", "<i>Total Number ofSharesPurchased [a]</i>", "<i>AveragePrice PaidPer Share</i>", "<i>Total Number of SharesPurchased as Part of aPublicly Announced Planor Program [b]</i>", "<i>Maximum Number ofShares That May Yet</i><i>Be Purchased Under the Planor Program [b]</i>"], ["Oct. 1 through Oct. 31", "725,450", "84.65", "519,554", "17,917,736"], ["Nov. 1 through Nov. 30", "1,205,260", "89.92", "1,106,042", "16,811,694"], ["Dec. 1 through Dec. 31", "1,133,106", "92.59", "875,000", "15,936,694"], ["Total", "3,063,816", "$89.66", "2,500,596", "N/A"]]}

Question: for the quarter ended december 312010 what was percent of the total number of shares attested to upc by employees to pay stock option exercise prices
Evidence:
table_4: period the total of total number ofsharespurchased [a] is 3063816 ; the total of averageprice paidper share is $ 89.66 ; the total of total number of sharespurchased as part of apublicly announced planor program [b] is 2500596 ; the total of maximum number ofshares that may yetbe purchased under the planor program [b] is n/a ;
text_5: [b] on may 1 , 2008 , our board of directors authorized us to repurchase up to 40 million shares of our common stock through march 31 , 2011 .
text_4: [a] total number of shares purchased during the quarter includes approximately 563220 shares delivered or attested to upc by employees to pay stock option exercise prices , satisfy excess tax withholding obligations for stock option exercises or vesting of retention units , and pay withholding obligations for vesting of retention shares .
Program: divide(563220, 3063816)
Answer:
str_answer: 18.4%
exe_answer: 0.18383