Year	Percent
1970	96.23494
1971	96.60266
1972	97.09724
1973	97.4359
1974	97.76224
1975	98.21429
1976	98.51552
1977	98.80795
1978	99.21875
1979	99.61588
1980	99.87421
1981	100.37129
1982	100.60827
1983	100.83732
1984	101.29564
1985	101.62225
1986	101.8244
1987	102.13244
1988	102.43094
1989	102.72035
1990	103.00107
1991	103.1679
1992	103.43392
1993	103.69231
1994	103.94338
1995	104.18744
1996	104.42478
1997	104.66019
1998	104.88506
1999	105.10397
2000	105.22388
2001	105.43278
2002	105.54545
2003	105.84007
2004	105.94499
2005	106.04733
2006	106.23917
2007	106.33562
2008	106.43522
2009	106.5272
2010	106.7053
2011	106.79771
2012	106.80162
2013	106.89103
2014	106.97859
2015	107.06436