Year	Percent
2002	12.61
2003	17.11
2004	17.55
2005	18.31
2006	15.97
2007	13.85
2008	12.44
2009	14.96
2010	14.9586
2011	15.7729
2012	13.4446
2013	12.6834
2014	10.2323
2015	12.8889
2016	11.6892
2017	12.9621