Year	%
2004	20.6
2005	20.6
2006	20.4
2007	20.4
2008	20.1
2009	20.6
2010	20.7
2011	20.8
2012	21.1
2013	21.4
2014	21.2
2015	21.1
2016	20.6
2017	20.4
2018	21
2019	20.7
2020	20.5
2021	20.7