Year	%
2004	24.2
2005	28.1
2006	22.8
2007	22.3
2008	22.1
2009	21.5
2010	23.1
2011	23.2
2012	23.9
2013	24.4
2014	24
2015	23.8
2016	23.8
2017	23.9
2018	23.2
2019	23.3
2020	23.3
2021	24.1