Year	Percent
1970	100.17331
1971	100.68027
1972	101
1973	101.30719
1974	101.76282
1975	102.04403
1976	102.31481
1977	102.57186
1978	102.97177
1979	103.207
1980	103.58166
1981	103.65682
1982	104.01107
1983	104.21196
1984	104.53939
1985	104.72441
1986	105.03876
1987	105.20966
1988	105.375
1989	105.53506
1990	105.56901
1991	105.84726
1992	105.99295
1993	106.14137
1994	106.16438
1995	106.30631
1996	106.55556
1997	106.6886
1998	106.81081
1999	107.04376
2000	107.15789
2001	107.38046
2002	107.48718
2003	107.59109
2004	107.8
2005	107.89733
2006	108.08967
2007	108.18094
2008	108.26996
2009	108.4507
2010	108.53432
2011	108.61595
2012	108.78623
2013	108.86303
2014	108.84173
2015	108.91608