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	0.004867174799715757
1986	0.02689673721887737
1987	0.020230629172567266
1988	0.02469542311491604
1989	0.024390449036577264
1990	0.17514862964698916
1991	0.18903249730922642
1992	0.19383154587061957
1993	0.2088240698975927
1994	0.24839080152773696
1995	0.2445967834295905
1996	0.2979999617948767
1997	0.22806668235379296
1998	0.24134465906846114
1999	0.24368902663406575
2000	0.2013879630344324
2001	0.2324297147378572
2002	0.249539312039312
2003	0.513738761964582
2004	0.5549147647288546
2005	0.6062151626653065
2006	0.8447311544109154
2007	0.9389326437051839
2008	0.9277817517369349
2009	0.9192313271593157
2010	0.9972573394569856
2011	1.305689641528844
2012	1.2990644008619514
2013	1.6607212446416257
2014	1.7525101610185094
2015	1.8843540250969275