Year	Percent
1970	99.81273
1971	100.18349
1972	100.71942
1973	101.0582
1974	101.38169
1975	101.86441
1976	102.32558
1977	102.60586
1978	103.03514
1979	103.44828
1980	103.84615
1981	104.22961
1982	104.44444
1983	104.79651
1984	105.14286
1985	105.46985
1986	105.78512
1987	106.08931
1988	106.38298
1989	106.79739
1990	106.93196
1991	107.19697
1992	107.57764
1993	107.81441
1994	107.92317
1995	108.27423
1996	108.48837
1997	108.69565
1998	109.01917
1999	109.101
2000	109.28962
2001	109.47255
2002	109.65005
2003	109.82236
2004	109.9897
2005	110.05076
2006	110.21021
2007	110.36525
2008	110.4187
2009	110.56676
2010	110.61611
2011	110.75772
2012	110.80332
2013	110.84777
2014	110.99099
2015	111.03203