Please answer the given financial question based on the context.
Context: 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 .
||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|
____________ 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. .
Question: what was the biggest decline , in percentage , from 2007-2008 , among the four groups?
Answer:
0.6855