Year	Percent
1987	0.1
1989	0.5
1993	0.4
2004	0.2
2005	1.2
2006	0.2
2007	0.2
2008	0.2
2009	0.2
2010	0.2
2011	0.2
2012	0.7
2013	0.7
2014	1
2015	1