Year	Percent
1970	94.06393
1971	94.64286
1972	94.98911
1973	95.31915
1974	95.842
1975	96.34146
1976	96.81909
1977	97.28155
1978	97.90875
1979	98.32714
1980	98.72727
1981	99.28826
1982	99.47826
1983	100.17036
1984	100.5
1985	100.81566
1986	101.44
1987	101.88088
1988	102.30415
1989	102.86145
1990	103.09735
1991	103.61795
1992	104.11932
1993	104.60251
1994	105.06849
1995	105.37634
1996	105.82011
1997	106.25
1998	106.53009
1999	107.06179
2000	107.3201
2001	107.70171
2002	108.06258
2003	108.29384
2004	108.76168
2005	108.97583
2006	109.29705
2007	109.49721
2008	109.80176
2009	109.98914
2010	110.16043
2011	110.33755
2012	110.61394
2013	110.66667
2014	110.82996
2015	110.97804