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	0.0036903773410831256
1993	0.0018025812964164683
1994	0
1995	0
1996	0
1997	0.019248267655910967
1998	0.020562285030656498
1999	0
2000	0
2001	0
2002	0.005480953685941353
2003	0.00544069640914037
2004	0.007079771323386255
2005	0.010098799925942134
2006	0.006379890584876469
2007	0.061615293564444736
2008	0.04464560625654289
2009	0.03290556103981573
2010	0.6879031326811726
2011	2.5597187051404053
2012	4.866097253887774
2013	8.869755364220309
2014	12.763412165271005
2015	14.515639695397592