Year	Percent
1970	94.95798
1971	95.39474
1972	95.80645
1973	96.20853
1974	96.59443
1975	96.9651
1976	97.47024
1977	97.81341
1978	98.1402
1979	98.59748
1980	98.89959
1981	99.19028
1982	99.60265
1983	100
1984	100.38314
1985	100.62657
1986	100.98401
1987	101.20773
1988	101.54211
1989	101.98135
1990	102.17391
1991	102.47191
1992	102.75938
1993	103.03359
1994	103.29787
1995	103.44468
1996	103.7037
1997	103.95538
1998	104.2
1999	104.43787
2000	104.66926
2001	104.89443
2002	105.11848
2003	105.33209
2004	105.54017
2005	105.65178
2006	105.85059
2007	105.95556
2008	106.15114
2009	106.25
2010	106.34648
2011	106.53096
2012	106.62196
2013	106.71642
2014	106.80886
2015	106.89376