Year	%
2000	23
2001	23.5
2002	24
2003	24.3
2004	24.3
2005	24.3
2006	25.3
2007	25.4
2008	25.6
2009	25.7
2010	25.8
2011	25.4
2012	25.2
2013	24.5
2014	23.6
2015	23.4
2016	23.7
2017	23.7
2018	23.7
2019	23.5