Year	Percent
1996	11.3
1997	10.4
1998	10.5
1999	10.6
2000	10.6
2001	10.9
2002	11.3
2003	11.4
2004	11.5
2005	11.2
2006	11.4
2007	11.1
2008	11
2009	11.1
2010	10.6
2011	10.9
2012	10.8
2013	10.9
2014	11.2
2015	11.4
2016	11.5