Year	%
2000	11.9
2001	11.6
2002	11
2003	10.5
2004	10.3
2005	10.2
2006	10.1
2007	9.9
2008	9.4
2009	9.1
2010	8.8
2011	8.6
2012	8.5
2013	8.2
2014	8.1
2015	8.1
2016	8.1
2017	8.2
2018	8.2
2019	8.2