Year	%
1992	20.7
1993	26.6
1996	25.8
2002	26.6
2004	27.5
2005	26.9
2006	26.7
2007	26
2008	26.3
2009	26.2
2010	26.6
2011	26.4
2012	26.1
2013	26.5
2014	25.9
2015	25.9
2016	25.4
2017	24.9
2018	25
2019	25.3
2020	26.2
2021	26.2