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	0.0014067863372910921
2002	0.0013468194857843203
2003	0.0012743886120633627
2004	0.00121530309659229
2005	0.0012095847495554777
2006	0.0011132138483802739
2007	0.001025472742934493
2008	0
2009	1.006870511969518
2010	0.8061801804689628
2011	0.8176368207309999
2012	0.6444363414470796
2013	0.9259259259259258
2014	0.6292847988390781
2015	0.6821073386489745