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	0.8126232741617356
2006	1.0373001776198936
2007	1.3437576349865623
2008	1.1213264601158526
2009	1.1847703161182617
2010	1.225075606130504
2011	1.3677959501557633
2012	1.304328795903182
2013	1.534757749021968
2014	2.0364504052330603
2015	2.102206736353078