Year	%
1996	2.7
2001	2.6
2002	3
2003	3.1
2004	3.4
2005	2.3
2006	3.7
2007	3.8
2008	4
2009	4
2010	4.1
2011	4.1
2012	4.1
2013	4.3
2014	4.3
2015	4.3
2016	4.2
2017	4.3
2018	4.3
2019	4.3
2020	4.3
2021	4.3