Year	Percent
1970	100.86022
1971	101.26316
1972	101.64948
1973	102.22222
1974	102.57426
1975	102.90698
1976	103.22581
1977	103.72439
1978	104.0146
1979	104.29338
1980	104.5614
1981	104.81928
1982	105.23649
1983	105.29801
1984	105.52846
1985	105.91054
1986	105.95611
1987	106.31741
1988	106.35401
1989	106.69643
1990	106.72515
1991	106.75287
1992	106.93069
1993	107.10306
1994	107.12329
1995	107.1525
1996	107.17131
1997	107.32026
1998	107.19794
1999	107.34177
2000	107.34745
2001	107.60736
2002	107.6087
2003	107.72889
2004	107.84543
2005	107.95848
2006	107.94552
2007	108.05369
2008	108.26902
2009	108.2519
2010	108.45824
2011	108.43882
2012	108.52391
2013	108.71795
2014	108.79676
2015	108.87338