Year	%
2000	25.3
2001	24.9
2002	24.7
2003	24.7
2004	24.4
2005	24.1
2006	24.1
2007	24.1
2008	24
2009	23.8
2010	23.7
2011	23.7
2012	23.8
2013	23.7
2014	23.6
2015	23.6
2016	23.5
2017	23.5
2018	23.6
2019	23.7