Year	%
2000	14.8
2001	14.5
2002	14.6
2003	14.5
2004	13.8
2005	13.6
2006	13.3
2007	13
2008	13.2
2009	12.9
2010	13
2011	13.3
2012	13.2
2013	12.9
2014	13.4
2015	13.2
2016	13.4
2017	13.3
2018	12.9
2019	12.9