Year	Percent
2000	7.4
2002	5.9174
2003	4.6451
2004	5.3663
2005	4.8681
2006	4.7451
2007	4.5543
2008	4.5332
2009	3.9493
2010	3.7981
2011	3.6152
2012	3.4901
2013	3.5352
2014	3.0708
2015	2.9629
2016	3.5715
2017	3.5003