Consider the following table for a seven-year period. Returns U.S. Treasury Year Bills Inflation 1 4.05% -1.27% 2 3.90 -2.41 3 4.80 -1.31 4 5.22 0.73 3.02 -6.55 6 1.90 -9.47 7 1.63 -1.42 What was the average real return for Treasury bills for this time period? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16. Average real return %