Year	%
2000	9.6
2001	9.5
2002	9.3
2003	9.3
2004	9.2
2005	8.7
2006	8.9
2007	9
2008	8.7
2009	8.7
2010	8.8
2011	8.7
2012	8.9
2013	8.7
2014	8.1
2015	8.1
2016	8.2
2017	8
2018	8
2019	8