performance graph this graph compares the return on lilly stock with that of the standard & poor 2019s 500 stock index and our peer group for the years 2014 through 2018 . the graph assumes that , on december 31 , 2013 , a person invested $ 100 each in lilly stock , the s&p 500 stock index , and the peer groups' common stock . the graph measures total shareholder return , which takes into account both stock price and dividends . it assumes that dividends paid by a company are reinvested in that company 2019s stock . value of $ 100 invested on last business day of 2013 comparison of five-year cumulative total return among lilly , s&p 500 stock index , peer group ( 1 ) .
( 1 ) we constructed the peer group as the industry index for this graph . it comprises the companies in the pharmaceutical and biotech industries that we used to benchmark the compensation of our executive officers for 2018 : abbvie inc. ; amgen inc. ; astrazeneca plc ; baxter international inc. ; biogen idec inc. ; bristol-myers squibb company ; celgene corporation ; gilead sciences inc. ; glaxosmithkline plc ; johnson & johnson ; medtronic plc ; merck & co. , inc. ; novartis ag. ; pfizer inc. ; roche holdings ag ; sanofi ; and shire plc. .
Lilly Peer Group S&P 500
Dec-13 $100.00 $100.00 $100.00
Dec-14 $139.75 $114.39 $113.69
Dec-15 $175.21 $116.56 $115.26
Dec-16 $157.03 $112.80 $129.05
Dec-17 $185.04 $128.90 $157.22
Dec-18 $259.88 $136.56 $150.33
lilly peer group s&p 500
dec-13 $ 100.00 $ 100.00 $ 100.00
dec-14 $ 139.75 $ 114.39 $ 113.69
dec-15 $ 175.21 $ 116.56 $ 115.26
dec-16 $ 157.03 $ 112.80 $ 129.05
dec-17 $ 185.04 $ 128.90 $ 157.22
dec-18 $ 259.88 $ 136.56 $ 150.33
what was the difference in percentage return for lilly compared to the s&p 500 for the five years ended dec-18?