Year	%
2000	11.7
2001	11.9
2002	11.6
2003	11.7
2004	11.3
2005	11.1
2006	11
2007	10.9
2008	10.3
2009	10.5
2010	10.5
2011	10.2
2012	10.2
2013	9.8
2014	9.5
2015	9.4
2016	9.1
2017	8.7
2018	8.5
2019	8.3