Year	Percent
2002	10.57
2003	13.06
2004	14.81
2005	14.73
2006	13.19
2009	9.42
2010	8.85
2011	9.03
2012	9.33
2013	12.67
2014	12.26
2015	9.72
2016	8.69
2017	6.81