Year	%
2000	27.5
2001	27
2002	27.2
2003	27.4
2004	27.7
2005	27.6
2006	27.1
2007	27.1
2008	27.4
2009	27.3
2010	26.9
2011	27
2012	27
2013	27
2014	27.1
2015	27.1
2016	26.9
2017	27
2018	26.9
2019	26.7