Year	Percent
1970	128.7037
1971	128.61446
1972	128.82353
1973	129.02299
1974	129.21348
1975	129.3956
1976	129.56989
1977	129.65879
1978	129.48718
1979	129.8995
1980	129.72973
1981	129.80769
1982	129.57746
1983	129.65517
1984	129.4382
1985	129.51542
1986	129.31034
1987	129.11392
1988	128.92562
1989	128.74494
1990	128.31683
1991	128.15534
1992	127.94677
1993	127.56052
1994	127.18978
1995	126.83363
1996	126.84211
1997	126.6323
1998	126.59933
1999	126.56766
2000	126.53722
2001	126.50794
2002	126.63551
2003	126.41221
2004	126.53673
2005	126.47059
2006	126.40693
2007	126.52482
2008	126.4624
2009	126.36612
2010	126.30872
2011	126.38522
2012	126.32944
2013	126.24204
2014	126.19048
2015	126.10837