Consider the following table for a seven-year period: Returns U.S. Treasury Year Bills Inflation 1234567 4.20% -1.30% 4.05 -2.44 4.95 -1.34 5.37 0.76 3.17 -6.58 2.05 1.78 -9.50 -1.45 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 %