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. .
the stock price performance included in this graph is not necessarily indicative of future stock price performance. .
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
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
what is the increase observed in the return of the second year of the investment for peer group?