Year	% of total
1960	0
1961	0
1962	0
1963	0
1964	2.4242424242424243
1965	2.7649769585253456
1966	4.682274247491639
1967	3.296703296703297
1968	4.545454545454546
1969	4.578313253012048
1970	5.0113895216400905
1971	4.914529914529915
1972	4.831932773109243
1973	4.3478260869565215
1974	5.949656750572082
1975	4.3557168784029034
1976	4.036697247706423
1977	4.247104247104247
1978	3.215926493108729
1979	3.3546325878594256
1980	2.9366306027820714
1981	2.707581227436823
1982	2.3483365949119372
1983	3.2
1984	1.8867924528301887
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
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0