Year	%
2000	24.6
2001	24.1
2002	24
2003	23.7
2004	23.5
2005	24.7
2006	24.7
2007	25.1
2008	25.2
2009	24.5
2010	24.3
2011	24.4
2012	24.1
2013	23.8
2014	23.1
2015	22.5
2016	22.3
2017	22.5
2018	22.8
2019	22.7