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	0.7393715341959335
1982	1.6177957532861478
1983	1.9607843137254901
1984	0.9646302250803858
1985	0
1986	0.5946481665014867
1987	0.9182736455463729
1988	0.6222222222222222
1989	0.4317789291882556
1990	0.4665394402035623
1991	0.363970223325062
1992	0.3796066252587992
1993	0.3588062622309198
1994	0.33766114180478823
1995	0.34648818897637795
1996	0.35544426494345716
1997	0.3359083969465648
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