Year	Percent
2002	6.45
2004	3.65
2005	3.09
2006	5.36
2009	3.41
2010	3.49
2011	3.81
2012	3.89
2013	6.15
2014	4.45
2015	3.75
2016	2.81
2017	2.8
2018	2.36