Year	Percent
1970	95.05062
1971	95.34884
1972	95.747
1973	96.02578
1974	96.40212
1975	96.76747
1976	97.01953
1977	97.36575
1978	97.7023
1979	97.93103
1980	98.3463
1981	98.56046
1982	98.76894
1983	99.06455
1984	99.35305
1985	99.5438
1986	99.81966
1987	100.17841
1988	100.35273
1989	100.61029
1990	100.86281
1991	101.02389
1992	101.26689
1993	101.4214
1994	101.65563
1995	101.80328
1996	102.03087
1997	102.25261
1998	102.39044
1999	102.60664
2000	102.73865
2001	102.86822
2002	103.07456
2003	103.12262
2004	103.32326
2005	103.44311
2006	103.48665
2007	103.67918
2008	103.79562
2009	103.90738
2010	104.0201
2011	104.05694
2012	104.16667
2013	104.20463
2014	104.31154
2015	104.34783