The following table shows the nominal returns on Andorran stocks. Year 2012 2013 2014 2015 2016 2017 Nominal Return (%) 0.2 -19.0 -17.0 -42.8 67.6 28.3 What was the standard deviation of the market returns? (Use decimals, not percents, in your calculations. Do not round ntermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Standard deviation %