Please answer the given financial question based on the context.
Context: shareholder return performance presentation the graph presented below compares the cumulative total shareholder return on state street's common stock to the cumulative total return of the s&p 500 index , the s&p financial index and the kbw bank index over a five- year period . the cumulative total shareholder return assumes the investment of $ 100 in state street common stock and in each index on december 31 , 2008 at the closing price on the last trading day of 2008 , and also assumes reinvestment of common stock dividends . the s&p financial index is a publicly available measure of 81 of the standard & poor's 500 companies , representing 17 diversified financial services companies , 22 insurance companies , 19 real estate companies and 23 banking companies . the kbw bank index seeks to reflect the performance of banks and thrifts that are publicly traded in the u.s. , and is composed of 24 leading national money center and regional banks and thrifts. .
||2008|2009|2010|2011|2012|2013|
|state street corporation|$ 100|$ 111|$ 118|$ 105|$ 125|$ 198|
|s&p 500 index|100|126|146|149|172|228|
|s&p financial index|100|117|132|109|141|191|
|kbw bank index|100|98|121|93|122|168|
.
Question: how much higher are the returns of the s&p 500 in the same period ( 2008-2013 ) ? as a percentage .
Answer:
0.0228