Year	Percent
1990	0
1997	0
1998	0.03787
1999	0.14816
2000	0.27174
2001	0.44307
2002	0.55487
2003	0.84819
2004	1.32733
2005	2
2006	2.2
2007	2.5
2008	3
2009	3.5
2010	5.1
2011	5.5
2012	5.9753
2013	6.5
2014	6.98
2015	7.45916
2016	7.93832