Year	Percent
1990	0
1996	0.00078
1997	0.00567
1998	0.01845
1999	0.07196
2000	0.10505
2001	0.13601
2002	0.27038
2003	0.37068
2004	0.46481
2005	1.14337
2006	1.5
2007	1.7
2008	1.9
2009	2.3
2010	2.8
2011	3.1
2012	6.5
2013	8.9
2014	10.2
2015	12.4
2016	13