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	0.008352962795903708
1994	0.13710460012642112
1995	0.15379329526676594
1996	0.26743586314924833
1997	0.21358625807736167
1998	0.1906708694419871
1999	0.22896955522663898
2000	0.1480587463423876
2001	0.1969883043345669
2002	0.15202702702702703
2003	0.28030636829819344
2004	0.33966959412208125
2005	0.27323399759554085
2006	0.38854333371830196
2007	0.5613024568002821
2008	0.3116213517284362
2009	3.232579268432344
2010	3.9476460182735846
2011	3.2373189839360608
2012	1.7941409126865062
2013	1.842081597170179
2014	1.8410207752113634
2015	1.805144453245508