Year	%
2000	26.9
2001	27
2002	27.2
2003	27.6
2004	27.7
2005	27.6
2006	27.2
2007	26.9
2008	26.6
2009	26.3
2010	26
2011	25.7
2012	25.5
2013	25.5
2014	25.3
2015	25.1
2016	25
2017	24.9
2018	24.8
2019	24.9