what is the roi of an investment is s&p500 index from 2012 to 2015?
state street corporation | 52 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 , 2012 . it also assumes reinvestment of common stock dividends . the s&p financial index is a publicly available , capitalization-weighted index , comprised of 67 of the standard & poor 2019s 500 companies , representing 27 diversified financial services companies , 23 insurance companies , and 17 banking companies . the kbw bank index is a modified cap-weighted index consisting of 24 exchange-listed stocks , representing national money center banks and leading regional institutions. .

|  | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| State Street Corporation | $100 | $159 | $172 | $148 | $178 | $227 |
| S&P 500 Index | 100 | 132 | 151 | 153 | 171 | 208 |
| S&P Financial Index | 100 | 136 | 156 | 154 | 189 | 230 |
| KBW Bank Index | 100 | 138 | 151 | 151 | 195 | 231 |

.

start_value = 100
end_value = 153
answer = (end_value - start_value) / 100 * 100