Year	Percent
2002	4.33128
2003	4.30745
2004	4.01598
2005	3.75249
2006	3.23076
2007	3.11491
2008	2.55641
2009	2.72078
2010	3.96257
2011	5.29636
2012	5.94256
2013	6.75446
2014	6.08107
2015	6.01067
2016	4.11122
2017	3.09318