Excel Please :)

Consider the following table for a seven-year period:

		Returns
Year	U.S. Treasury Bills			Inflation
1		3.55	%	1.17	%
2		3.40		2.31
3		4.30		1.21
4		4.72		0.63
5		2.52		6.45
6		1.40		9.37
7		1.13		1.32

What was the average real return for Treasury bills for this time period?