Year	%
2000	11
2001	10.9
2002	10.7
2003	10.4
2004	10
2005	9.9
2006	9.5
2007	9.6
2008	9.5
2009	9.1
2010	9.1
2011	8.7
2012	8.7
2013	8.6
2014	8.2
2015	7.7
2016	7.9
2017	7.7
2018	7.5
2019	7.4