Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: performance graph the graph below compares the cumulative total shareholder return on pmi's common stock with the cumulative total return for the same period of pmi's peer group and the s&p 500 index . the graph assumes the investment of $ 100 as of december 31 , 2012 , in pmi common stock ( at prices quoted on the new york stock exchange ) and each of the indices as of the market close and reinvestment of dividends on a quarterly basis . date pmi pmi peer group ( 1 ) s&p 500 index . <table class='wikitable'><tr><td>1</td><td>date</td><td>pmi</td><td>pmi peer group ( 1 )</td><td>s&p 500 index</td></tr><tr><td>2</td><td>december 31 2012</td><td>$ 100.00</td><td>$ 100.00</td><td>$ 100.00</td></tr><tr><td>3</td><td>december 31 2013</td><td>$ 108.50</td><td>$ 122.80</td><td>$ 132.40</td></tr><tr><td>4</td><td>december 31 2014</td><td>$ 106.20</td><td>$ 132.50</td><td>$ 150.50</td></tr><tr><td>5</td><td>december 31 2015</td><td>$ 120.40</td><td>$ 143.50</td><td>$ 152.60</td></tr><tr><td>6</td><td>december 31 2016</td><td>$ 130.80</td><td>$ 145.60</td><td>$ 170.80</td></tr><tr><td>7</td><td>december 31 2017</td><td>$ 156.80</td><td>$ 172.70</td><td>$ 208.10</td></tr></table> ( 1 ) the pmi peer group presented in this graph is the same as that used in the prior year , except reynolds american inc . was removed following the completion of its acquisition by british american tobacco p.l.c . on july 25 , 2017 . the pmi peer group was established based on a review of four characteristics : global presence ; a focus on consumer products ; and net revenues and a market capitalization of a similar size to those of pmi . the review also considered the primary international tobacco companies . as a result of this review , the following companies constitute the pmi peer group : altria group , inc. , anheuser-busch inbev sa/nv , british american tobacco p.l.c. , the coca-cola company , colgate-palmolive co. , diageo plc , heineken n.v. , imperial brands plc , japan tobacco inc. , johnson & johnson , kimberly-clark corporation , the kraft-heinz company , mcdonald's corp. , mondel z international , inc. , nestl e9 s.a. , pepsico , inc. , the procter & gamble company , roche holding ag , and unilever nv and plc . note : figures are rounded to the nearest $ 0.10. .
Question: what was the change in the pmi's share price from 2012 to 2013?
Answer: 8.5
Question: and how much did this change represent in relation to that price in 2012?

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