Year	%
2000	15.5
2001	14.7
2002	15.1
2003	15.7
2004	15.8
2005	15.9
2006	16.1
2007	15.6
2008	15.1
2009	15
2010	14.8
2011	14.3
2012	14.2
2013	14.2
2014	13.7
2015	13.4
2016	13.7
2017	13.9
2018	13.5
2019	13.3