Year	%
2000	14.7
2001	13.8
2002	13.6
2003	13.4
2004	13.4
2005	13
2006	12.5
2007	12.5
2008	12.2
2009	12.2
2010	12
2011	11.7
2012	11.4
2013	11.1
2014	10.6
2015	10.6
2016	10.4
2017	10.3
2018	10
2019	9.6