Year	%
2000	22
2001	22.7
2002	22.4
2003	19.6
2004	20.1
2005	21.3
2006	21.2
2007	22.4
2008	22.1
2009	22
2010	21.4
2011	21.1
2012	21.8
2013	21.5
2014	21.6
2015	21.1
2016	21.1
2017	21.4
2018	21.1
2019	21