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	0.48342541436464087
2002	0.4718738358375761
2003	0.3259536564900278
2004	0.08535784635587657
2005	0.12120438887471294
2006	1.292758631723785
2007	1.7316793345762225
2008	1.8219749652294854
2009	2.0949882325707008
2010	2.494174191669094
2011	4.316317873303167
2012	4.839734538266026
2013	5.278108999088167
2014	7.440695447178429
2015	8.163112045659357