Year	Percent
1970	94.03825
1971	94.4629
1972	94.76554
1973	95.16649
1974	95.44974
1975	95.82899
1976	96.19733
1977	96.4539
1978	96.8032
1979	97.23866
1980	97.56809
1981	97.79271
1982	98.10606
1983	98.40973
1984	98.70729
1985	98.99635
1986	99.27928
1987	99.55476
1988	99.82394
1989	100.08703
1990	100.34423
1991	100.51064
1992	100.75758
1993	101
1994	101.15416
1995	101.38776
1996	101.53597
1997	101.84295
1998	101.98413
1999	102.20126
2000	102.33645
2001	102.46914
2002	102.67789
2003	102.80516
2004	102.93013
2005	103.12966
2006	103.17578
2007	103.36996
2008	103.41322
2009	103.53026
2010	103.64546
2011	103.75887
2012	103.87051
2013	103.91061
2014	103.9501
2015	104.05777