Year	%
2000	17
2001	16.3
2002	16.7
2003	16.7
2004	17
2005	16.7
2006	16.7
2007	16.8
2008	16.7
2009	16.3
2010	16.2
2011	16.1
2012	15.5
2013	15.4
2014	15.7
2015	15.6
2016	15.7
2017	15.7
2018	15.8
2019	16