Year	%
2004	8.8
2005	8.9
2006	8.8
2007	8.7
2008	8.6
2009	8.5
2010	8.6
2011	8.4
2012	8
2013	7.7
2014	7.6
2015	7.8
2016	8.2
2017	8.4
2018	8.4
2019	8.5
2020	8.5
2021	8.5