Year	% of total
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
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	0.07785562632696391
1999	3.1453347280334727
2000	7.130277777777777
2001	5.578854700854701
2002	6.101696574225122
2003	6.6081831610044315
2004	6.071511169513797
2005	6.937567567567568
2006	4.109962640099626
2007	3.790511033681766
2008	5.171953757225434
2009	5.399263803680983
2010	6.789086479902558
2011	7.559533029612756
2012	7.743227571115973
2013	7.381113490364025
2014	6.008298097251585
2015	3.046545086119554
2016	4.642265957446808