Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.


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 , 2008 and ending december 31 , 2013 . our peer group comprises the following 11 companies : alon usa energy , inc. ; bp plc ; cvr energy , inc. ; delek us holdings , inc . ( dk ) ; hollyfrontier corporation ; marathon petroleum corporation ; pbf energy inc . ( pbf ) ; phillips 66 ; royal dutch shell plc ; tesoro corporation ; and western refining , inc . our peer group previously included hess corporation , but it has exited the refining business , and was replaced in our peer group by dk and pbf who are also engaged in refining operations . comparison of 5 year cumulative total return1 among valero energy corporation , the s&p 500 index , old peer group , and new peer group . <table class='wikitable'><tr><td>1</td><td>-</td><td>12/2008</td><td>12/2009</td><td>12/2010</td><td>12/2011</td><td>12/2012</td><td>12/2013</td></tr><tr><td>2</td><td>valero common stock</td><td>$ 100.00</td><td>$ 79.77</td><td>$ 111.31</td><td>$ 102.57</td><td>$ 170.45</td><td>$ 281.24</td></tr><tr><td>3</td><td>s&p 500</td><td>100.00</td><td>126.46</td><td>145.51</td><td>148.59</td><td>172.37</td><td>228.19</td></tr><tr><td>4</td><td>old peer group</td><td>100.00</td><td>126.98</td><td>122.17</td><td>127.90</td><td>138.09</td><td>170.45</td></tr><tr><td>5</td><td>new peer group</td><td>100.00</td><td>127.95</td><td>120.42</td><td>129.69</td><td>136.92</td><td>166.57</td></tr></table> ____________ 1 assumes that an investment in valero common stock and each index was $ 100 on december 31 , 2008 . 201ccumulative total return 201d is based on share price appreciation plus reinvestment of dividends from december 31 , 2008 through december 31 , 2013. .
Question: what is the value of an investment in valero common stock	in 2010?
Answer: 111.31
Question: what about in 2009?
Answer: 79.77
Question: what is the difference in the value?

31.54