Year	%
2000	13.4
2001	13.2
2002	13.1
2003	13.1
2004	13.1
2005	13.1
2006	13.1
2007	13
2008	13
2009	13.1
2010	13.1
2011	13.2
2012	13.3
2013	13.5
2014	13.7
2015	13.9
2016	14.1
2017	14.4
2018	14.6
2019	14.9