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	1.9419237749546279
2005	1.9362788241506779
2006	1.9805481874447393
2007	2.0422660273486057
2008	2.0344827586206895
2009	1.2263668880940215
2010	1.1567476948868398
2011	1.0493523528447286
2012	0.9407069555302165
2013	0.8888888888888888
2014	0.8447984552256819
2015	1.2053725175066008