Year	% of total
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0.48249999999999993
2002	0.6548214285714286
2003	0.5962601626016261
2004	0.5276258992805755
2005	0.43396449704142015
2006	0.47934640522875815
2007	0.5201418439716312
2008	0.5023287671232877
2009	0.5057931034482759
2010	0.4214942528735632
2011	0.3761025641025641
2012	0.3005737704918032
2013	0.3202620087336244
2014	0.27780303030303033
2015	0.2666909090909091
2016	0.3174891774891775