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	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0.09354591836734694
1994	0.08221973094170403
1995	0.07393145161290322
1996	0.08353075170842823
1997	0.06892857142857142
1998	0.064673721340388
1999	0.06536541889483066
2000	0.06513321492007104
2001	0.06247018739352641
2002	0.06173400673400673
2003	0.05632872503840246
2004	0.054895209580838315
2005	0.05361111111111111
2006	0.0507192254495159
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0