Year	%
2000	15.9
2001	15.2
2002	14.5
2003	14.8
2004	14.9
2005	14.7
2006	14.4
2007	13.6
2008	13
2009	12.1
2010	11.9
2011	11.4
2012	11.2
2013	11.1
2014	10.9
2015	11.2
2016	11.3
2017	11.2
2018	10.8
2019	10.8