Consider the following table for a seven-year period: Retuns U.S. Treasury Bills Inflation -1.13% -2.27 Year 3.35% 3.20 4.10 4.52 2.32 1.20 2 6.41 -9.33 93 What was the average real return for Treasury bills for this time period? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Average real return