Year	Percent
2002	3.65
2003	4.38
2004	4.22
2005	4.47
2006	4.5
2007	3.93
2008	3.44
2009	3.99
2010	4.444
2011	4.3257
2012	3.5841
2013	3.6326
2014	2.5303
2015	2.6151
2016	2.9242
2017	3.1087