Year	%
2000	13.4
2001	13.5
2002	14.8
2003	14.8
2004	15
2005	15.5
2006	15.3
2007	15
2008	15.1
2009	14.5
2010	14.1
2011	13.9
2012	13.8
2013	13.3
2014	12.7
2015	12.6
2016	12.6
2017	12.4
2018	12.1
2019	11.8