Year	Percent
1992	0.2
1993	0.4
1994	0.4
1995	0.4
2000	0.4
2001	0.4
2002	0.4
2003	0.3
2004	0.4
2005	0.3
2006	0.2
2007	4.99
2008	4.89
2009	5
2010	5.4
2011	5
2012	4.9
2013	4.9
2014	5.1
2015	5.2
2016	5.2
2017	5.8
2018	9.3
2019	9