Year	%
2000	24.1
2001	24
2002	24.5
2003	23.8
2004	23.5
2005	23.2
2006	23.2
2007	23.9
2008	25.1
2009	25.3
2010	25.8
2011	26
2012	25.8
2013	25.8
2014	25.9
2015	26.1
2016	25.8
2017	24.9
2018	23.9
2019	23.9