The historical stock returns for GAF, Inc. are listed below

Year	Annual Stock Return
2013	-9%
2014	14%
2015	35%
2016	2%
2017	-13%
2018	8%
2019	0%
2020	34%
2021	12%
2022	6%

What is the standard deviation of returns for GAF, Inc. stock over the 10-year time period? (Compute the standard deviation assuming this is a population of returns, not a sample that is, use the procedure described in the textbook for calculating the standard deviation of a series of stock returns