Year	%
2000	17.6
2001	17
2002	16.1
2003	15.9
2004	14.9
2005	14.1
2006	14.8
2007	13.6
2008	13.1
2009	12.5
2010	12.3
2011	11.3
2012	11.3
2013	11.1
2014	10.8
2015	10.5
2016	10.6
2017	10.4
2018	9.9
2019	8.8