Year	%
2000	25.7
2001	25.6
2002	25.6
2003	25.4
2004	25.4
2005	25.3
2006	25.3
2007	25.3
2008	25.1
2009	25.1
2010	25.1
2011	24.9
2012	25.1
2013	25.1
2014	24.9
2015	24.8
2016	24.7
2017	24.4
2018	24.2
2019	23.9