human
stock total return performance the following graph compares our total return to stockholders with the returns of the standard & poor 2019s composite 500 index (201cs&p 500 201d) and the dow jones us select health care providers index (201cpeer group 201d) for the five years ended december 31, 2017. the graph assumes an investment of $100 in each of our common stock, the s&p 500, and the peer group on december 31, 2012, and that dividends were reinvested when paid. .
|  | 12/31/2012 | 12/31/2013 | 12/31/2014 | 12/31/2015 | 12/31/2016 | 12/31/2017 |
| --------- | --------- | --------- | --------- | --------- | --------- | --------- |
| HUM | $100 | $152 | $214 | $267 | $307 | $377 |
| S&P 500 | $100 | $132 | $150 | $153 | $171 | $208 |
| Peer Group | $100 | $137 | $175 | $186 | $188 | $238 |
the stock price performance included in this graph is not necessarily indicative of future stock price performance. .
Please answer the following question with expressions if necessary.
by how much did this performance change since 2012?
assistant
subtract(214, 100)