Year	%
2003	2.3
2004	2.4
2005	2.4
2006	2.5
2007	2.6
2008	2.6
2009	2.7
2010	2.7
2011	2.5
2012	2.2
2013	2.1
2014	2.3
2015	2.4
2016	2.4
2017	2.7
2018	2.8
2019	2.8
2020	2.4
2021	2.8