Year	Percent
2002	4.67568
2003	4.19314
2004	4.03802
2005	3.75652
2006	3.34309
2007	3.22109
2008	2.80259
2009	2.97433
2010	3.83008
2011	4.60221
2012	5.35
2013	5.85924
2014	5.72516
2015	5.52519
2016	3.76197
2017	2.86986