Year	%
2000	25.6
2001	25.7
2002	25.6
2003	25.6
2004	25.4
2005	26
2006	26
2007	25.4
2008	25.2
2009	25
2010	24.8
2011	24.7
2012	24.3
2013	24.6
2014	24.3
2015	23.7
2016	23.2
2017	22.6
2018	22.4
2019	22.3