Year	% of total
1960	100
1961	100
1962	100
1963	100
1964	100
1965	100
1966	100
1967	100
1968	100
1969	100
1970	100
1971	100
1972	100
1973	100
1974	100
1975	100
1976	100
1977	100
1978	100
1979	100
1980	100
1981	100
1982	100
1983	100
1984	100
1985	100
1986	100
1987	100
1988	100
1989	100
1990	96.25875
1991	105.93555555555557
1992	87.09125
1993	93.71222222222222
1994	101.86111111111111
1995	95.342
1996	96.25875
1997	110.01
1998	88.008
1999	100.00909090909092
2000	95.342
2001	88.008
2002	102.67600000000002
2003	97.78666666666666
2004	84.62307692307692
2005	87.44384615384617
2006	85.56333333333333
2007	87.44384615384617
2008	93.08538461538461
2009	94.29428571428572
2010	97.78666666666666
2011	93.34181818181818
2012	96.67545454545456
2013	94.73083333333334
2014	103.34272727272729
2015	110.00999999999999
2016	85.56333333333333