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
1997	0.03261
1998	0.06369
1999	0.1243
2000	0.1817
2001	0.35376
2002	2.0931
2003	3.39797
2004	4.32159
2005	5.64811
2006	7.83255
2007	11.5
2008	14
2009	17.3
2010	20.7
2011	22.5
2012	24.3001
2013	26.2
2014	28.09
2015	29.9798
2016	31.86963