Assume these are the stock market and Treasury bill returns for a 5-year period Stock Market T-Bill Year 2011 2012 2013 2014 2015 Return (%) Return (%) -37.03 28.60 16.86 1.28 16.36 1.80 0.30 0.14 0.06 0.08 a. What was the risk premium on common stock in each year? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) Year Ri 2011 2012 2013 2014 2015 sk Premium