Year	%
2000	28.5
2001	28.1
2002	27.9
2003	27.4
2004	26.8
2005	26.6
2006	26.2
2007	26
2008	25.9
2009	26.4
2010	25.5
2011	26.5
2012	25.7
2013	25.9
2014	25.4
2015	25.1
2016	24.9
2017	24.8
2018	24.6
2019	24.3