Please answer the given financial question based on the context.
Context: stock performance graph the following graph compares the most recent five-year performance of alcoa 2019s common stock with ( 1 ) the standard & poor 2019s 500 ae index and ( 2 ) the standard & poor 2019s 500 ae materials index , a group of 27 companies categorized by standard & poor 2019s as active in the 201cmaterials 201d market sector . such information shall not be deemed to be 201cfiled . 201d five-year cumulative total return based upon an initial investment of $ 100 on december 31 , 2010 with dividends reinvested alcoa inc . s&p 500 ae index s&p 500 ae materials index dec-'10 dec-'11 dec-'12 dec-'14 dec-'15dec-'13 .
|as of december 31,|2010|2011|2012|2013|2014|2015|
|alcoainc .|$ 100|$ 57|$ 58|$ 72|$ 107|$ 68|
|s&p 500 aeindex|100|102|118|157|178|181|
|s&p 500 aematerials index|100|90|104|130|139|128|
s&p 500 ae index 100 102 118 157 178 181 s&p 500 ae materials index 100 90 104 130 139 128 copyright a9 2016 standard & poor 2019s , a division of the mcgraw-hill companies inc . all rights reserved . source : research data group , inc . ( www.researchdatagroup.com/s&p.htm ) .
Question: what was the percentual increase observed in the alcoainc . investment during 2013 and 2014?
Answer:
0.48611