Consider the following table for a seven-year period: Returns Year U.S. Treasury Bills Inflation Year 1 3.60 % 1.18 % Year 2 3.45 2.32 Year 3 4.35 1.22 Year 4 4.77 0.64 Year 5 2.57 6.46 Year 6 1.45 9.38 Year 7 1.18 10.33 Required: What was the average real return for Treasury bills for this time period?