Year	%
2000	27.2
2001	26.9
2002	26.5
2003	26.2
2004	26
2005	25.6
2006	25.4
2007	25.1
2008	25
2009	24.8
2010	24.4
2011	24.3
2012	24.2
2013	24.1
2014	23.9
2015	23.8
2016	24
2017	24.3
2018	24.6
2019	24.8