Year	Percent
1990	0
1991	0.01328
1992	0.03887
1993	0.11375
1994	0.24691
1995	0.67674
1996	0.84188
1997	1.63209
1998	2.90622
1999	4.11625
2000	5.34856
2001	6.34662
2002	6.71032
2003	7.00769
2004	8.42512
2005	7.48854
2006	7.60714
2007	8.06538
2008	8.43
2009	10
2010	24
2011	33.97
2012	41
2013	46.5
2014	49
2015	51.91912
2016	54