Year	Percent
1970	90.625
1971	91.00228
1972	91.36771
1973	91.83223
1974	92.17391
1975	92.61242
1976	93.03797
1977	93.34719
1978	93.75
1979	94.04642
1980	94.42786
1981	94.79882
1982	95.15973
1983	95.51098
1984	95.85297
1985	96.18605
1986	96.51056
1987	96.73617
1988	97.04566
1989	97.34748
1990	97.64192
1991	97.84297
1992	98.20819
1993	98.39798
1994	98.66555
1995	98.92828
1996	99.10277
1997	99.35432
1998	99.60064
1999	99.8419
2000	100
2001	100.23256
2002	100.38373
2003	100.60837
2004	100.75301
2005	100.97015
2006	101.10947
2007	101.31965
2008	101.45349
2009	101.58501
2010	101.78699
2011	101.84266
2012	102.03938
2013	102.09205
2014	102.21453
2015	102.33516