Year	%
2000	14.2
2001	13.6
2002	12.8
2003	13
2004	12.5
2005	14.5
2006	12.4
2007	12.1
2008	12.3
2009	12.5
2010	12.3
2011	11.4
2012	11
2013	11
2014	10.7
2015	10.4
2016	10.2
2017	9.9
2018	9.6
2019	9.4