Year	%
2004	5.7
2005	6.4
2006	6.8
2007	7.2
2008	7.3
2009	7.3
2010	7.3
2011	7.3
2012	7.2
2013	7.2
2014	7.2
2015	7.4
2016	8
2017	8.3
2018	8.2
2019	8.6
2020	8.6
2021	8.6