Year	Percent
2002	11.22
2004	7.97
2005	7.41
2006	7.71
2008	7.34
2009	7.41
2010	7.71
2011	7.58
2012	7.69
2013	7.43
2014	7.03
2015	6.54
2016	6.18
2017	5.59