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
2006	0.5302929868752485
2007	1.0149708195889366
2008	1.0597430123195126
2009	1.0185892538833716
2010	1.0120177103099304
2011	1.012786428661856
2012	0
2013	0
2014	0.07918552036199095
2015	0.04473272198613285