Year	Percent
1970	102.96192
1971	103.3241
1972	103.53741
1973	103.87701
1974	104.20499
1975	104.51613
1976	104.82234
1977	105.1186
1978	105.39877
1979	105.67633
1980	105.93824
1981	106.19159
1982	106.44419
1983	106.68177
1984	106.91193
1985	107.13502
1986	107.35135
1987	107.56124
1988	107.66002
1989	107.85936
1990	108.05301
1991	108.24121
1992	108.42418
1993	108.5044
1994	108.67888
1995	108.84872
1996	109.02256
1997	109.09091
1998	109.24908
1999	109.31284
2000	109.375
2001	109.53222
2002	109.59024
2003	109.56072
2004	109.71039
2005	109.68013
2006	109.74188
2007	109.71193
2008	109.77199
2009	109.83078
2010	109.80861
2011	109.86582
2012	109.84375
2013	109.82212
2014	109.80092
2015	109.78756