Year	% of total
1960	0
1961	0
1962	0
1963	0
1964	9.67741935483871
1965	18.181818181818183
1966	21.09375
1967	8.771929824561402
1968	19.402985074626866
1969	2.452316076294278
1970	2.8124999999999996
1971	10.294117647058824
1972	12.5
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
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0.6202114164904862
2010	1.0434552845528455
2011	1.1304816955684007
2012	1.1501660516605166
2013	3.680143369175627
2014	14.435701357466064
2015	27.01100233100233
2016	27.11357575757576