Year	Percent
1970	95.64516
1971	95.89258
1972	96.13003
1973	96.21212
1974	96.58247
1975	96.65211
1976	96.86163
1977	97.06294
1978	97.39369
1979	97.57739
1980	97.62533
1981	97.92746
1982	98.09403
1983	98.25218
1984	98.40686
1985	98.55596
1986	98.81797
1987	99.06977
1988	99.2
1989	99.4382
1990	99.66814
1991	99.89119
1992	100.21436
1993	100.52798
1994	100.83247
1995	101.12821
1996	101.41557
1997	101.79462
1998	102.16535
1999	102.42718
2000	102.77778
2001	103.02457
2002	103.26493
2003	103.49908
2004	103.72727
2005	103.94973
2006	104.16667
2007	104.38212
2008	104.58874
2009	104.70488
2010	104.90694
2011	105.01672
2012	105.21092
2013	105.3148
2014	105.50162
2015	105.60448