Year	%
2000	14.5
2001	14.4
2002	14.3
2003	14.3
2004	14
2005	13.5
2006	13.3
2007	13.7
2008	13.3
2009	13.2
2010	13.2
2011	13.2
2012	13.1
2013	12.8
2014	12.4
2015	12.5
2016	12.9
2017	12.4
2018	12.2
2019	12.1