Consider the following table for a seven-year period: Returns Year U.S. Treasury Bills Inflation Year 1 3.70 % 1.20 % Year 2 3.55 2.34 Year 3 4.45 1.24 Year 4 4.87 0.66 Year 5 2.67 6.48 Year 6 1.55 9.40 Year 7 1.28 10.35 Required: What was the average real return for Treasury bills for this time period?