Year	% of total
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	5.360134003350084
1983	17.62962962962963
1984	20.857142857142858
1985	43.62244897959184
1986	29.058823529411764
1987	36.86440677966102
1988	42.42718446601942
1989	56.18181818181818
1990	55.90909090909091
1991	41.5785764622974
1992	37.58389261744966
1993	40
1994	23.29656067488644
1995	5.514705882352941
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