Year	%
2000	26
2001	25.4
2002	25.6
2003	25.5
2004	25.6
2005	25.4
2006	25.1
2007	24.7
2008	24.6
2009	24.4
2010	24.5
2011	24.5
2012	24.5
2013	24.4
2014	24.3
2015	23.9
2016	23.9
2017	24
2018	23.7
2019	23.4