Suppose we have the following returns for large-company stocks and Treasury bills over a six year period:
Year Large Company US Treasury Bill
1 3.92 5.90
2 14.18 2.53
3 19.37 3.76
4 -14.31 7.16
5 -31.80 5.42
6 37.08 6.24
Calculate the observed risk premium in each year for the large-company stocks versus the T-bills. What was the average risk premium over this period, in %? (Negative amount should be indicated by a minus sign. Do not round intermediate calculations and round your final answer to 2 decimal places. (e.g., 32.16))