Consider the following table for a seven-year period: Year -NMON Returns U.S. Treasury Bills Inflation 3.65% -1.19% 3.50 -2.33 4.40 -1.23 4.82 0.65 2.62 -6.47 1.50 -9.39 1.23 -1.34 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 %