Year	Percent
2002	10.87
2004	6.96
2005	6.63
2006	6.71
2009	6.12
2010	6.63
2011	6.6
2012	6.37
2013	7.05
2014	6.89
2015	6.16
2016	5.83
2017	5.73
2018	3.79