Year	%
2000	24.1
2001	23.8
2002	23.6
2003	23.5
2004	23.3
2005	23.2
2006	23
2007	22.8
2008	22.6
2009	22.5
2010	22.4
2011	22.3
2012	22.3
2013	22.3
2014	22.4
2015	22.5
2016	22.6
2017	22.7
2018	22.8
2019	22.9