Year	%
2000	15.4
2001	14.6
2002	14
2003	13.4
2004	13
2005	13.2
2006	12.9
2007	12.5
2008	11.8
2009	11.5
2010	11.7
2011	11.4
2012	11
2013	10.6
2014	10.6
2015	10.5
2016	10
2017	10
2018	10
2019	10.2