Year	%
2000	28.5
2001	28.6
2002	28.6
2003	28.5
2004	28.4
2005	28.1
2006	27.8
2007	27.6
2008	27.2
2009	27.2
2010	27
2011	26.9
2012	26.7
2013	26.4
2014	26.1
2015	25.9
2016	25.6
2017	25.2
2018	24.9
2019	24.5