Year	%
2000	16.9
2001	16.8
2002	16.7
2003	16.5
2004	16.4
2005	16.4
2006	15.4
2007	15.1
2008	15
2009	15
2010	14.8
2011	14.9
2012	15.1
2013	15
2014	14.8
2015	14.8
2016	15.1
2017	15.2
2018	17.6
2019	17.4