Year	Percent
1970	94.9848
1971	95.37313
1972	95.75403
1973	96.25899
1974	96.61017
1975	96.94868
1976	97.41144
1977	97.85523
1978	98.15547
1979	98.57513
1980	98.98089
1981	99.24812
1982	99.63009
1983	100
1984	100.23866
1985	100.58754
1986	100.92593
1987	101.25428
1988	101.57303
1989	101.88261
1990	102.07424
1991	102.36814
1992	102.65393
1993	102.93194
1994	103.09917
1995	103.36391
1996	103.62173
1997	103.76984
1998	104.01567
1999	104.15459
2000	104.38931
2001	104.51977
2002	104.74419
2003	104.86685
2004	105.08167
2005	105.19713
2006	105.40301
2007	105.42432
2008	105.62284
2009	105.81694
2010	105.83263
2011	106.02007
2012	106.12076
2013	106.21931
2014	106.31579
2015	106.41026