Year	Percent
2002	9.3852
2003	9.7838
2004	8.6715
2005	9.3267
2006	7.4794
2007	8.8597
2008	7.8714
2009	7.9866
2010	7.4674
2011	7.7858
2012	6.4079
2013	6.7311
2014	7.4977
2015	7.2133
2016	8.6958
2017	8.6623