Year	Percent
2002	4.2793
2003	3.1588
2004	3.3552
2005	3.4037
2006	2.6852
2007	2.3145
2008	2.2684
2009	2.4445
2010	2.048
2011	1.9165
2012	1.8256
2013	2.035
2014	1.8041
2015	2.1602
2016	2.3833
2017	2.2492