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
2000	0
2001	0
2002	5.924847161572052
2003	6.288619153674832
2004	6.871372912801485
2005	6.532045855379189
2006	8.03184919210054
2007	11.415016129032258
2008	9.339390625
2009	11.138857142857143
2010	9.597837837837837
2011	12.449392338177015
2012	10.961675603217158
2013	10.254781523096131
2014	13.221738623103851
2015	15.331853448275861
2016	17.447822580645163