Year	%
2000	12.7
2001	12.1
2002	12.1
2003	12.3
2004	11.5
2005	11.4
2006	10.9
2007	10.1
2008	10.4
2009	11.7
2010	11.7
2011	11.5
2012	11.1
2013	10.8
2014	10.4
2015	10.1
2016	9.9
2017	9.8
2018	9.7
2019	9.6