Year	%
2000	13
2001	13.2
2002	12.4
2003	12.1
2004	12
2005	11.1
2006	10.9
2007	10.8
2008	10.3
2009	10.1
2010	9.9
2011	10.3
2012	9.6
2013	9.4
2014	9.1
2015	9.3
2016	9.1
2017	9.2
2018	8.7
2019	8.5