Year	Percent
1970	95.23242
1971	95.54513
1972	95.96309
1973	96.25426
1974	96.64804
1975	97.02643
1976	97.39696
1977	97.64957
1978	98
1979	98.33853
1980	98.56704
1981	98.88889
1982	99.20239
1983	99.41003
1984	99.70874
1985	100
1986	100.18957
1987	100.4686
1988	100.74143
1989	100.91659
1990	101.08794
1991	101.3465
1992	101.51111
1993	101.67254
1994	101.83086
1995	101.9879
1996	102.14408
1997	102.29787
1998	102.44932
1999	102.68231
2000	102.74314
2001	102.88541
2002	103.02782
2003	103.16558
2004	103.30113
2005	103.4345
2006	103.56577
2007	103.69497
2008	103.74123
2009	103.86698
2010	103.99079
2011	104.03349
2012	104.22961
2013	104.26966
2014	104.30906
2015	104.42152