Year	%
2000	16
2001	15.5
2002	14.9
2003	14.4
2004	14
2005	13.9
2006	13.4
2007	13
2008	12.7
2009	12.2
2010	12.1
2011	11.9
2012	11.3
2013	11.4
2014	11.2
2015	11.3
2016	10.9
2017	10.5
2018	10.6
2019	10.4