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	97.78666666666666
1991	97.78666666666666
1992	73.33999999999999
1993	77.92375
1994	82.5075
1995	80.674
1996	91.67500000000001
1997	80.674
1998	70.00636363636364
1999	73.34
2000	78.98153846153846
2001	73.34
2002	85.56333333333333
2003	83.81714285714285
2004	89.383125
2005	89.383125
2006	84.12529411764706
2007	101.86111111111111
2008	91.675
2009	32.269600000000004
2010	95.74944444444444
2011	90.5964705882353
2012	66.006
2013	99.22470588235294
2014	97.78666666666666
2015	97.78666666666666
2016	99.82388888888889