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
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	3.0362446581196583
2004	1.381768115942029
2005	2.535064308681672
2006	2.905447834645669
2007	4.882206025267251
2008	4.5168013631937685
2009	5.062440142638818
2010	7.248720930232558
2011	8.047369429803545
2012	9.201390942698707
2013	9.594597647058825
2014	9.408297373358348
2015	8.647552238805972
2016	7.825731807031888