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	100.84250000000002
1991	93.71222222222222
1992	70.28416666666666
1993	85.56333333333333
1994	86.43642857142856
1995	85.56333333333333
1996	88.008
1997	82.5075
1998	84.92
1999	86.85
2000	91.67500000000001
2001	85.56333333333332
2002	81.31173913043477
2003	86.09478260869565
2004	88.00800000000001
2005	88.00800000000001
2006	88.00800000000001
2007	75.78466666666667
2008	103.34272727272729
2009	31.48434343434343
2010	88.00800000000001
2011	86.09478260869565
2012	63.25575
2013	95.00863636363637
2014	75.86896551724138
2015	100.00909090909092
2016	81.4888888888889