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	0.00005
1992	0.00034
1993	0.01358
1994	0.03861
1995	0.07483
1996	0.11547
1997	0.36052
1998	1.09122
1999	2.42624
2000	3.68904
2001	5.55633
2002	7.53125
2003	9.29903
2004	10.6773
2005	15.026
2006	17.16071
2007	20.03
2008	18.2
2009	20.1
2010	22.4
2011	23.66993
2012	26.46
2013	28.94
2014	34.89
2015	39.31613
2016	47.50497
2017	52.89193