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 dj trans , and the s&p 500 . the graph assumes that $ 100 was invested in the common stock of union pacific corporation and each index on december 31 , 2008 and that all dividends were reinvested . the information below is historical in nature and is not necessarily indicative of future performance . purchases of equity securities 2013 during 2013 , we repurchased 14996957 shares of our common stock at an average price of $ 152.14 . the following table presents common stock repurchases during each month for the fourth quarter of 2013 : 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 5264 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 april 1 , 2011 , our board of directors authorized the repurchase of up to 40 million shares of our common stock by march 31 , 2014 . these repurchases may be made 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 november 21 , 2013 , the board of directors approved the early renewal of the share repurchase program , authorizing the repurchase of 60 million common shares by december 31 , 2017 . the new authorization is effective january 1 , 2014 , and replaces the previous authorization , which expired on december 31 , 2013 , three months earlier than its original expiration date. .
table: <i>Period</i> <i>Total Number ofSharesPurchased [a]</i> <i>AveragePrice PaidPer Share</i> <i>Total Number of SharesPurchased as Part ofaPublicly Announced Planor Program [b]</i> <i>Maximum Number ofShares That May YetBe Purchased Under the Planor Program [b]</i>
table: Oct. 1 through Oct. 31 1,405,535 153.18 1,405,535 4,020,650
table: Nov. 1 through Nov. 30 1,027,840 158.66 1,025,000 2,995,650
table: Dec. 1 through Dec. 31 2,500,944 163.14 2,498,520 497,130
table: Total 4,934,319 $159.37 4,929,055 N/A
question: Analyse this data from a financial earnings document. what was the percent of the total number of share repurchase in the fourth quarter of 2013 that was attested to upc by employees to pay stock option exercise prices