Year	Percent
2004	4.2794
2005	4.3962
2006	5.1257
2007	4.3629
2008	2.6541
2009	3.2132
2010	2.8178
2011	2.5535
2012	2.6906
2013	2.0783
2014	1.8047
2015	2.5714
2016	2.5266
2017	2.0268