Year	Percent
2002	6.54
2003	9.44
2004	9.61
2005	10.13
2006	8.77
2009	6.39
2010	6.02
2011	5.67
2012	5.73
2013	7.12
2014	6.45
2015	4.72
2016	4.98
2017	4.13