Year	Percent
1970	94.78992
1971	95.22241
1972	95.63813
1973	96.03803
1974	96.42302
1975	96.94656
1976	97.30135
1977	97.64359
1978	98.11594
1979	98.43305
1980	98.7395
1981	99.03581
1982	99.45726
1983	99.73298
1984	100.13158
1985	100.51881
1986	100.89514
1987	101.13493
1988	101.49254
1989	101.71779
1990	102.06061
1991	102.39521
1992	102.60047
1993	103.04094
1994	103.23699
1995	103.54286
1996	103.84615
1997	104.1387
1998	104.54042
1999	104.81928
2000	105.09209
2001	105.35906
2002	105.62036
2003	105.98111
2004	106.22407
2005	106.35897
2006	106.70051
2007	106.82046
2008	107.14286
2009	107.36016
2010	107.46848
2011	107.67018
2012	107.8673
2013	107.96626
2014	108.1557
2015	108.34097