Year	Percent
1970	89.06883
1971	89.50495
1972	90.11628
1973	90.70209
1974	91.09462
1975	91.47005
1976	91.99288
1977	92.50871
1978	93.00341
1979	93.47826
1980	93.94435
1981	94.38202
1982	94.81132
1983	95.37037
1984	95.76399
1985	96.14243
1986	96.793
1987	97.13877
1988	97.61236
1989	97.93103
1990	98.37398
1991	98.8016
1992	99.21466
1993	99.6139
1994	100
1995	100.3736
1996	100.61275
1997	100.84439
1998	101.30797
1999	101.63934
2000	101.84544
2001	102.15909
2002	102.46361
2003	102.75938
2004	102.82609
2005	103.10825
2006	103.38266
2007	103.54167
2008	103.90545
2009	104.05268
2010	104.3
2011	104.43787
2012	104.57198
2013	104.80307
2014	104.92891
2015	105.145