Year	Percent
1970	94.2446
1971	94.83568
1972	95.18349
1973	95.73034
1974	96.26374
1975	96.55914
1976	97.05263
1977	97.3251
1978	97.78226
1979	98.41897
1980	98.64603
1981	99.05303
1982	99.44238
1983	99.81785
1984	100.17857
1985	100.52539
1986	101.03093
1987	101.34907
1988	101.82119
1989	102.11382
1990	102.55591
1991	102.98273
1992	103.24074
1993	103.64188
1994	104.02985
1995	104.40529
1996	104.76879
1997	105.12091
1998	105.60224
1999	105.92287
2000	106.24152
2001	106.54206
2002	106.96452
2003	107.2445
2004	107.51592
2005	107.90464
2006	108.28183
2007	108.39416
2008	108.753
2009	108.97285
2010	109.30233
2011	109.50745
2012	109.70655
2013	109.89989
2014	110.07667
2015	110.25918