Year	%
2000	13.7
2001	14.4
2002	14.8
2003	14.3
2004	14.2
2005	13.6
2006	14
2007	13.5
2008	13.6
2009	13.7
2010	13.5
2011	13
2012	14
2013	13.4
2014	13.4
2015	13.2
2016	12.4
2017	12.9
2018	12.8
2019	12.7