Year	%
2000	24.3
2001	24.9
2002	25.3
2003	25.9
2004	26.4
2005	26.9
2006	27.5
2007	28
2008	28.1
2009	28.1
2010	28.1
2011	27.8
2012	27.6
2013	27.2
2014	26.7
2015	26.3
2016	25.9
2017	25.3
2018	24.6
2019	24.3