Year	Percent
2002	17.44
2003	18.97
2004	21.46
2005	19.07
2006	17.95
2007	14.9
2008	10.14
2009	15.76
2010	20.0203
2011	14.1891
2012	12.8362
2013	11.8822
2014	9.5501
2015	9.204
2016	10.8724
2017	10.9228