Please answer the given financial question based on the context.
Context: table of contents company stock performance the following graph shows a five-year comparison of cumulative total shareholder return , calculated on a dividend reinvested basis , for the company , the s&p 500 index , the s&p computer hardware index , and the dow jones u.s . technology supersector index . the graph assumes $ 100 was invested in each of the company 2019s common stock , the s&p 500 index , the s&p computer hardware index , and the dow jones u.s . technology supersector index as of the market close on september 30 , 2008 . data points on the graph are annual . note that historic stock price performance is not necessarily indicative of future stock price performance . fiscal year ending september 30 . copyright 2013 s&p , a division of the mcgraw-hill companies inc . all rights reserved . copyright 2013 dow jones & co . all rights reserved . *$ 100 invested on 9/30/08 in stock or index , including reinvestment of dividends . september 30 , september 30 , september 30 , september 30 , september 30 , september 30 .
||september 30 2008|september 30 2009|september 30 2010|september 30 2011|september 30 2012|september 30 2013|
|apple inc .|$ 100|$ 163|$ 250|$ 335|$ 589|$ 431|
|s&p 500 index|$ 100|$ 93|$ 103|$ 104|$ 135|$ 161|
|s&p computer hardware index|$ 100|$ 118|$ 140|$ 159|$ 255|$ 197|
|dow jones us technology supersector index|$ 100|$ 111|$ 124|$ 128|$ 166|$ 175|
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Question: by how much did apple inc . outperform the s&p computer hardware index over the above mentioned 6 year period?
Answer:
2.34