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	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	1.7424927186903687
2001	1.4919626528058525
2002	3.566392212163945
2003	3.3458384226138547
2004	3.7765409193980624
2005	3.1530648260716108
2006	2.9826741720886027
2007	2.8231599345160534
2008	2.704286154794943
2009	2.3808800753135535
2010	2.3711340206185567
2011	1.58580424750784
2012	3.2325051915234306
2013	2.79501677929481
2014	0.7151292481301667
2015	0.8393608422623365