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	0.22693
1997	0.30944
1998	0.56963
1999	1.11991
2000	2.20387
2001	3.61729
2002	5.34777
2003	5.97659
2004	6.58825
2005	6.86961
2006	11.03635
2007	16.3
2008	23.2
2009	24.8
2010	26.53
2011	34
2012	38.9301
2013	44.1
2014	49.28
2015	54.46196
2016	59.09259