Year	Percent
1970	95.12761
1971	95.54795
1972	95.8427
1973	96.23894
1974	96.51795
1975	96.89175
1976	97.25449
1977	97.60666
1978	97.94872
1979	98.18182
1980	98.50598
1981	98.82122
1982	99.03195
1983	99.33142
1984	99.623
1985	99.90698
1986	100.18365
1987	100.36265
1988	100.53715
1989	100.79646
1990	101.04987
1991	101.29758
1992	101.45423
1993	101.60745
1994	101.75732
1995	101.90555
1996	102.1329
1997	102.27457
1998	102.41352
1999	102.62948
2000	102.76243
2001	102.89289
2002	103.02091
2003	103.14658
2004	103.26996
2005	103.39111
2006	103.51008
2007	103.55292
2008	103.66838
2009	103.70909
2010	103.8961
2011	103.93419
2012	104.04542
2013	104.08163
2014	104.18994
2015	104.2273