Year	%
2000	15.3
2001	14.7
2002	13.9
2003	13.7
2004	13.2
2005	12.8
2006	12.5
2007	12.3
2008	12.1
2009	12.4
2010	12.4
2011	12.2
2012	12
2013	11.8
2014	11.7
2015	11.6
2016	11.2
2017	10.8
2018	10.9
2019	10.4