Year	%
2000	12
2001	12.3
2002	11.4
2003	11.4
2004	10.9
2005	10.7
2006	9.9
2007	9.7
2008	9.5
2009	9.2
2010	8.9
2011	9
2012	9.3
2013	8.7
2014	8.5
2015	9
2016	8.2
2017	8.8
2018	8.6
2019	8