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	0.02284669865204478
2006	0.021496130696474634
2007	0.06158899609936358
2008	0.29533372711163614
2009	0.5944391179290508
2010	1.3716647876738068
2011	3.6112801785352
2012	5.448378206487174
2013	7.6223776223776225
2014	7.287356321839081
2015	8.780057357158615