{"pre_text": ["table of contents the following performance graph is not 201csoliciting material , 201d is not deemed filed with the sec , and is not to be incorporated by reference into any of valero 2019s filings under the securities act of 1933 or the securities exchange act of 1934 , as amended , respectively .", "this performance graph and the related textual information are based on historical data and are not indicative of future performance .", "the following line graph compares the cumulative total return 1 on an investment in our common stock against the cumulative total return of the s&p 500 composite index and an index of peer companies ( that we selected ) for the five-year period commencing december 31 , 2007 and ending december 31 , 2012 .", "our peer group consists of the following ten companies : alon usa energy , inc. ; bp plc ( bp ) ; cvr energy , inc. ; hess corporation ; hollyfrontier corporation ; marathon petroleum corporation ; phillips 66 ( psx ) ; royal dutch shell plc ( rds ) ; tesoro corporation ; and western refining , inc .", "our peer group previously included chevron corporation ( cvx ) and exxon mobil corporation ( xom ) but they were replaced with bp , psx , and rds .", "in 2012 , psx became an independent downstream energy company and was added to our peer group .", "cvx and xom were replaced with bp and rds as they were viewed as having operations that more closely aligned with our core businesses .", "comparison of 5 year cumulative total return1 among valero energy corporation , the s&p 500 index , old peer group , and new peer group ."], "post_text": ["____________ 1 assumes that an investment in valero common stock and each index was $ 100 on december 31 , 2007 .", "201ccumulative total return 201d is based on share price appreciation plus reinvestment of dividends from december 31 , 2007 through december 31 , 2012. ."], "table": [["", "12/2007", "12/2008", "12/2009", "12/2010", "12/2011", "12/2012"], ["valero common stock", "$ 100.00", "$ 31.45", "$ 25.09", "$ 35.01", "$ 32.26", "$ 53.61"], ["s&p 500", "100.00", "63.00", "79.67", "91.67", "93.61", "108.59"], ["old peer group", "100.00", "80.98", "76.54", "88.41", "104.33", "111.11"], ["new peer group", "100.00", "66.27", "86.87", "72.84", "74.70", "76.89"]], "table_ori": [["", "12/2007", "12/2008", "12/2009", "12/2010", "12/2011", "12/2012"], ["Valero Common Stock", "$100.00", "$31.45", "$25.09", "$35.01", "$32.26", "$53.61"], ["S&P 500", "100.00", "63.00", "79.67", "91.67", "93.61", "108.59"], ["Old Peer Group", "100.00", "80.98", "76.54", "88.41", "104.33", "111.11"], ["New Peer Group", "100.00", "66.27", "86.87", "72.84", "74.70", "76.89"]]}

Question: what was the biggest decline , in percentage , from 2007-2008 , among the four groups?
Evidence:
table_1: the valero common stock of 12/2007 is $ 100.00 ; the valero common stock of 12/2008 is $ 31.45 ; the valero common stock of 12/2009 is $ 25.09 ; the valero common stock of 12/2010 is $ 35.01 ; the valero common stock of 12/2011 is $ 32.26 ; the valero common stock of 12/2012 is $ 53.61 ;
table_2: the s&p 500 of 12/2007 is 100.00 ; the s&p 500 of 12/2008 is 63.00 ; the s&p 500 of 12/2009 is 79.67 ; the s&p 500 of 12/2010 is 91.67 ; the s&p 500 of 12/2011 is 93.61 ; the s&p 500 of 12/2012 is 108.59 ;
table_3: the old peer group of 12/2007 is 100.00 ; the old peer group of 12/2008 is 80.98 ; the old peer group of 12/2009 is 76.54 ; the old peer group of 12/2010 is 88.41 ; the old peer group of 12/2011 is 104.33 ; the old peer group of 12/2012 is 111.11 ;
table_4: the new peer group of 12/2007 is 100.00 ; the new peer group of 12/2008 is 66.27 ; the new peer group of 12/2009 is 86.87 ; the new peer group of 12/2010 is 72.84 ; the new peer group of 12/2011 is 74.70 ; the new peer group of 12/2012 is 76.89 ;
text_7: comparison of 5 year cumulative total return1 among valero energy corporation , the s&p 500 index , old peer group , and new peer group .
Program: subtract(const_100, 31.45), divide(#0, const_100)
Answer:
str_answer: 68.55%
exe_answer: 0.6855