Year	%
2000	14.9
2001	14.6
2002	14.9
2003	14.9
2004	15.1
2005	14.6
2006	14.8
2007	15.1
2008	15.4
2009	15.3
2010	15.5
2011	15.5
2012	14.7
2013	14.3
2014	14.8
2015	14.7
2016	14.7
2017	14.7
2018	14.6
2019	14.6