Year	%
2000	26
2001	25.5
2002	24.9
2003	24.5
2004	24.1
2005	23.6
2006	23.3
2007	22.9
2008	22.6
2009	22.3
2010	22
2011	21.9
2012	21.8
2013	21.7
2014	21.6
2015	21.6
2016	21.6
2017	21.6
2018	21.6
2019	21.7