Year	% of total
1960	22.666666666666668
1961	13.709677419354838
1962	7.763975155279504
1963	1.9108280254777066
1964	6.2874251497006
1965	4.62962962962963
1966	5.660377358490566
1967	5.535055350553506
1968	6.140350877192982
1969	3.289473684210526
1970	1.330603889457523
1971	0.8602150537634409
1972	0.16273393002441006
1973	0.4507888805409466
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
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0