Year	%
2000	11.2
2001	10
2002	10.1
2003	10.7
2004	10.5
2005	10.6
2006	10.5
2007	9.5
2008	9.5
2009	9.6
2010	9.6
2011	10.1
2012	9.7
2013	9.7
2014	9.6
2015	9.5
2016	9.2
2017	9.4
2018	8.9
2019	8.8