Year	Percent
1970	88.34356
1971	88.8
1972	89.41176
1973	90.01919
1974	90.41353
1975	90.80882
1976	91.53153
1977	91.88713
1978	92.56055
1979	93.05085
1980	93.52159
1981	93.82114
1982	94.41786
1983	94.99218
1984	95.39877
1985	95.78947
1986	96.31268
1987	96.67149
1988	97.15909
1989	97.62901
1990	98.21918
1991	98.52151
1992	98.94459
1993	99.48119
1994	99.87261
1995	100.25031
1996	100.61501
1997	101.08959
1998	101.42857
1999	101.75644
2000	102.07373
2001	102.38095
2002	102.67857
2003	102.96703
2004	103.24675
2005	103.51812
2006	103.67261
2007	103.92968
2008	104.17941
2009	104.42211
2010	104.65808
2011	104.88759
2012	105.01446
2013	105.23311
2014	105.44601
2015	105.5607