Year	Percent
1960	0
1965	0
1970	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	0.01093
1997	0.21114
1998	0.30558
1999	0.59036
2000	0.8
2001	0.9
2002	1
2003	1.2
2004	1.5
2005	1.8
2006	2
2007	2.2
2008	2.4
2009	2.6
2010	3
2011	3.5
2012	4
2013	4.5
2014	5.7
2015	7.12
2016	11.31
2017	12.36022