Year	%
2004	2.2
2005	2
2006	2.4
2007	2.3
2008	2.1
2009	1.9
2010	2.1
2011	2.3
2012	2.3
2013	2.3
2014	2.3
2015	2.5
2016	2.5
2017	2.3
2018	2.5
2019	2.6
2020	2.5
2021	2.6