Year	%
2004	27.1
2005	29.3
2006	25.8
2007	24.7
2008	26
2009	27.2
2010	27.3
2011	26.5
2012	26.1
2013	28.1
2014	26.1
2015	26.5
2016	25.2
2017	23.2
2018	25
2019	23.2
2020	24.2
2021	24.1