Year	Percent
1990	0
1992	0.00299
1993	0.02953
1994	0.04371
1995	0.08628
1996	0.14195
1997	0.28034
1998	0.83077
1999	3.28448
2000	7.03868
2001	9.78081
2002	10.88212
2003	11.9137
2004	16.03668
2005	17.72058
2006	20.9272
2007	25.94663
2008	28.11262
2009	34
2010	45
2011	51
2012	55.8
2013	59.9
2014	64.7
2015	68.04306
2016	70.96898