Year	Percent
1998	6.9169
2005	5.0029
2006	1.9115
2007	3.2148
2008	1.4234
2009	1.1204
2010	2.5768
2011	2.5988
2012	3.0232
2013	2.6265
2014	1.4205
2015	4.6426
2016	2.4822
2017	1.7069