Year	%
2000	11.3
2001	11.1
2002	11
2003	10.8
2004	10.5
2005	10.1
2006	9.9
2007	9.8
2008	9.6
2009	9.3
2010	9
2011	8.9
2012	8.8
2013	8.6
2014	8.5
2015	8.6
2016	8.6
2017	8.3
2018	8.1
2019	8