The 10-year returns of S&P500 index (which is made of 500 large stocks) are shown below.

S&P 500 Return in %	Year
18.25	2020
31.29	2019
-4.45	2018
21.69	2017
11.8	2016
1.34	2015
13.53	2014
32.21	2013
15.84	2012
2.06	2011

How much is the standard deviation (sample) of the S&P500 index's annual return between 2011 and 2020 ? Enter your answer in the following format: 0.1234 Hint: Use finance calculator. Do not enter answer as 12.34, enter it as 0.1234. Answer is between 0.1118 and 0.1351