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	0
2003	0
2004	0
2005	0
2006	0
2007	8.44493842364532
2008	8.66501827040195
2009	6.716575654152446
2010	6.607942157953281
2011	5.337164366373902
2012	7.21973087818697
2013	7.960922659430122
2014	10.97734193548387
2015	11.765530586766541
2016	11.923111111111112