Year	Percent
2002	10.8
2003	10.8
2004	11.4
2005	12
2006	11.9
2007	11.4
2008	11.7
2009	11.2
2010	10.5
2011	10
2012	10.9
2013	10.9
2014	11.9
2015	12.2
2016	12.3
2017	12.9
2018	12.7
2019	12.7