Year	%
2000	27.6
2001	27.2
2002	27.2
2003	27.5
2004	27.2
2005	26.1
2006	25.9
2007	25.9
2008	25.9
2009	26.1
2010	26.3
2011	26.2
2012	26.1
2013	26.1
2014	26.2
2015	26.1
2016	25.8
2017	25.7
2018	25.3
2019	24.8