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
table: Valero Common Stock $100.00 $31.45 $25.09 $35.01 $32.26 $53.61
table: S&P 500 100.00 63.00 79.67 91.67 93.61 108.59
table: Old Peer Group 100.00 80.98 76.54 88.41 104.33 111.11
table: New Peer Group 100.00 66.27 86.87 72.84 74.70 76.89
question: Analyse this data from a financial earnings document. what was the biggest decline , in percentage , from 2007-2008 , among the four groups?