Year	Percent
1960	60.72996
1961	67.22824
1962	59.72408
1963	57.39911
1964	57.76011
1965	56.63379
1966	67.37666
1967	66.07267
1968	62.15663
1969	61.10267
1970	55.26994
1971	56.68948
1972	78.75187
1973	83.06578
1974	89.16916
1975	117.87055
1976	155.01006
1977	128.22643
1978	117.30927
1979	128.42485
1980	120.95614
1981	130.35827
1982	160.86168
1983	133.43701
1984	141.074
1985	136.24845
1986	119.17348
1987	128.11128
1988	138.39604
1989	137.86703
1990	123.06865
1991	124.94158
1992	121.29468
1993	120.03454
1994	116.36772
1995	126.46101
1996	138.77684
1997	133.86827
1998	122.24567
1999	113.71962
2000	115.97041
2001	123.89383
2002	151.19621
2003	137.89235
2004	142.13657
2005	122.4877
2006	123.22551
2007	141.01969
2008	143.47641
2009	138.4886
2010	133.18201
2011	131.71219
2012	133.42917
2013	119.62355
2014	113.6089
2015	114.21124
2016	119.78916
2017	119.24428