Year	%
2000	10.7
2001	10.4
2002	9.9
2003	9.7
2004	9.4
2005	9.1
2006	8.9
2007	8.7
2008	8.7
2009	8.8
2010	8.8
2011	8.8
2012	8.9
2013	8.6
2014	8.7
2015	8.6
2016	8.4
2017	8
2018	8.1
2019	7.9