Year	%
2000	13.7
2001	13.3
2002	13.1
2003	13
2004	12.5
2005	12.4
2006	12
2007	11.8
2008	11.4
2009	11.3
2010	11
2011	10.9
2012	10.7
2013	10.4
2014	10.2
2015	10.3
2016	10.2
2017	10
2018	9.8
2019	9.6