Year	%
2000	15.3
2001	15.4
2002	16.1
2003	15.8
2004	15.8
2005	16.5
2006	14.6
2007	15.7
2008	16.1
2009	16
2010	15.4
2011	15.7
2012	16
2013	15.9
2014	16
2015	15
2016	15.8
2017	15.6
2018	15.6
2019	15.3