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
1999	0.4919146341463415
2000	6.072738853503186
2001	5.42013251783894
2002	9.8767335243553
2003	9.28926944971537
2004	10.506381395348836
2005	13.560260416666667
2006	14.68711555169418
2007	9.573795326349718
2008	10.53773131672598
2009	6.498481012658227
2010	11.241196506550217
2011	10.994752981260648
2012	12.464781893004115
2013	17.531698693312837
2014	17.71726164874552
2015	21.656395348837208
2016	23.81659793814433