Year	%
2000	25.3
2001	25.3
2002	25.3
2003	25.2
2004	25.1
2005	24.9
2006	24.7
2007	24.5
2008	24.1
2009	24.2
2010	24.1
2011	24.1
2012	24
2013	23.8
2014	23.7
2015	23.5
2016	23.3
2017	23.2
2018	22.9
2019	22.6