Year	%
1982	11.6
1992	12.2
2000	12.2
2002	12.3
2006	12
2007	12
2008	12
2009	12.3
2010	12.5
2011	12.6
2012	12.7
2013	12.4
2014	12.5
2015	12.5
2016	12.4
2017	12.5
2018	12.4
2019	12.2
2020	12.2