Year	Percent
1992	3
1993	1.3
1995	5.4
1996	5.4
2002	1.7
2003	0.6
2004	0.6
2005	0.3
2006	0.1
2007	0.1
2008	0
2009	0.1
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0.1
2016	0.1