Year	Percent
1960	176.5546
1961	157.04578
1962	148.58793
1963	155.79457
1964	133.00925
1965	134.36725
1966	130.56218
1967	121.70275
1968	131.20372
1969	141.64452
1970	145.11402
1971	139.90991
1972	122.38358
1973	127.47697
1974	164.64348
1975	146.45615
1976	156.43485
1977	164.25085
1978	169.19402
1979	190.37992
1980	208.98064
1981	201.64411
1982	187.2475
1983	166.36408
1984	156.7661
1985	152.06729
1986	146.23283
1987	161.20147
1988	175.38971
1989	168.50814
1990	167.10412
1991	155.31352
1992	149.51132
1993	151.66278
1994	149.84639
1995	164.52258
1996	159.86082
1997	155.48686
1998	146.28992
1999	160.35772
2000	176.88964
2001	168.2698
2002	168.32113
2003	177.66465
2004	190.0608
2005	196.4212
2006	200.28531
2007	183.98211
2008	210.40932
2009	168.76398
2010	173.69707
2011	176.44668
2012	173.62885
2013	171.61071
2014	167.9804
2015	151.65619
2016	142.06415
2017	149.08292