Year	Percent
1970	95.62842
1971	96.07143
1972	96.5035
1973	96.91252
1974	97.47475
1975	97.85479
1976	98.22006
1977	98.72814
1978	99.21997
1979	99.54058
1980	100
1981	100.29542
1982	100.72569
1983	101.14123
1984	101.54278
1985	101.93103
1986	102.44565
1987	102.94118
1988	103.28947
1989	103.62694
1990	103.95408
1991	104.5283
1992	104.83271
1993	105.25672
1994	105.66265
1995	106.06421
1996	106.4554
1997	106.83662
1998	107.32265
1999	107.56208
2000	107.91527
2001	108.25083
2002	108.69565
2003	108.90558
2004	109.2161
2005	109.51883
2006	109.81405
2007	110
2008	110.1712
2009	110.33797
2010	110.60904
2011	110.76625
2012	110.91954
2013	110.96408
2014	111.11111
2015	111.25461