Year	Percent
1970	97.01493
1971	97.28601
1972	97.75051
1973	98.19639
1974	98.43137
1975	98.65643
1976	99.05838
1977	99.26199
1978	99.45848
1979	99.64602
1980	100
1981	100.17007
1982	100.50083
1983	100.65466
1984	100.80257
1985	100.94488
1986	101.08192
1987	101.36571
1988	101.49031
1989	101.46199
1990	101.72414
1991	101.69252
1992	101.80055
1993	101.90736
1994	101.87416
1995	101.97368
1996	102.06986
1997	102.16285
1998	102.25282
1999	102.46305
2000	102.66667
2001	102.86396
2002	102.93427
2003	103.12139
2004	103.41686
2005	103.58744
2006	103.64238
2007	103.9173
2008	104.07288
2009	104.22386
2010	104.47451
2011	104.72279
2012	104.8583
2013	104.99002
2014	105.21654
2015	105.33981