Year	Percent
1990	0
1996	0.00088
1997	0.00163
1998	0.01176
1999	0.06718
2000	0.06283
2001	0.24067
2002	0.29278
2003	0.35692
2004	0.43085
2005	0.55604
2007	2.11539
2008	4.5
2009	7.7
2010	8
2011	7
2012	8.02385
2013	9
2014	10.6
2015	18
2016	20