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	0
2001	0
2002	0
2003	0
2004	0
2005	0.6163269936098612
2006	0.9346110866547017
2007	2.3899371069182394
2008	3.214682330936934
2009	2.937299943513463
2010	1.8926207403775435
2011	1.8730324100287636
2012	1.927432972282855
2013	2.306099397590361
2014	1.9697376667562
2015	1.689515514056701