Year	%
2000	21.1
2001	20.7
2002	20.4
2003	20.1
2004	19.9
2005	19.7
2006	19.5
2007	19.4
2008	19.2
2009	19.1
2010	19.1
2011	19
2012	19
2013	19.1
2014	19.1
2015	19.2
2016	19.2
2017	19.3
2018	19.3
2019	19.4