Year	%
2000	15.4
2001	14.7
2002	14.5
2003	14.2
2004	13.4
2005	13.2
2006	12.7
2007	12.8
2008	13.1
2009	12.6
2010	12.4
2011	12.1
2012	11.4
2013	11.1
2014	11.2
2015	11.4
2016	11
2017	11.1
2018	10.6
2019	10.5