pre_text: performance graph the following graph compares the cumulative five-year total return provided shareholders on our class a common stock relative to the cumulative total returns of the s&p 500 index and two customized peer groups . the old peer group includes intercontinentalexchange , inc. , nyse euronext and the nasdaq omx group inc . the new peer group is the same as the old peer group with the addition of cboe holdings , inc . which completed its initial public offering in june 2010 . an investment of $ 100 ( with reinvestment of all dividends ) is assumed to have been made in our class a common stock , in the peer groups and the s&p 500 index on december 31 , 2005 and its relative performance is tracked through december 31 , 2010 . comparison of 5 year cumulative total return* among cme group inc. , the s&p 500 index , an old peer group and a new peer group 12/05 12/06 12/07 12/08 12/09 12/10 cme group inc . s&p 500 old peer group *$ 100 invested on 12/31/05 in stock or index , including reinvestment of dividends . fiscal year ending december 31 . copyright a9 2011 s&p , a division of the mcgraw-hill companies inc . all rights reserved . new peer group the stock price performance included in this graph is not necessarily indicative of future stock price performance .
post_text: .
table: 2006 2007 2008 2009 2010
table: CME Group Inc. $139.48 $188.81 $58.66 $96.37 $93.73
table: S&P 500 115.80 122.16 76.96 97.33 111.99
table: Old Peer Group 155.58 190.78 72.25 76.11 87.61
table: New Peer Group 155.58 190.78 72.25 76.11 87.61
question: Analyse this data from a financial earnings document. considering the year 2006 , what is the percentual fluctuation of the return provided by s&p 500 and the one provided by old peer group?