The following data is provided for the S&P 500 index:

Year	Total Return	Year	Total Return
1988	16.81%	1998	28.58%
1989	31.49%	1999	21.04%
1990	-3.17%	2000	-9.11%
1991	30.55%	2001	-11.88%
1992	7.67%	2002	-22.10%
1993	9.99%	2003	28.70%
1994	1%	2004	10.87%
1995	37.43%	2005	4.91%
1996	23.07%	2006	15.80%
1997	33.36%	2007	5.49%

Refer to the information above. Calculate the 20-year geometric average annual rate of return on the S&P 500 Index

13.04%
	11.81%
	10.54%
	4.66%