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	0.29803
1997	0.99088
1998	1.48485
1999	2.47317
2000	4.06391
2001	5.1281
2002	14.75884
2003	18.64518
2004	19.57062
2005	20.4878
2006	21.39599
2007	22.29
2008	23.18
2009	24.05
2010	27
2011	30
2012	32
2013	35
2014	51.6
2015	53.81
2016	55.85641