Year	Percent
1996	6.3
2001	10.5
2002	6.9
2003	4.6
2004	2.3
2005	6.9
2006	0.6
2007	0.3
2008	0.1
2009	0.2
2010	0.1
2011	0
2012	0
2013	0
2014	0
2015	0