Year	Percent
2002	5.6461
2003	4.0633
2004	4.4523
2005	4.0014
2006	3.883
2007	3.6747
2008	3.5577
2009	3.4524
2010	2.9114
2011	2.7923
2012	2.5497
2013	3.2048
2014	2.2451
2015	2.4844
2016	2.7739
2017	2.8584