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	12
1983	16.80327868852459
1984	17.269076305220885
1985	17.12062256809339
1986	5.6521739130434785
1987	5.220883534136546
1988	7.885304659498209
1989	3.180212014134276
1990	3.235588235294118
1991	6.600599999999999
1992	7.741444444444445
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