Year	%
2000	14.9
2001	14.8
2002	14.4
2003	15
2004	15.3
2005	16
2006	16
2007	15.7
2008	15.5
2009	16.3
2010	16.7
2011	16.6
2012	16.9
2013	17
2014	17
2015	17.3
2016	17.2
2017	16.2
2018	16.6
2019	16.5