Year	%
1992	3.1
1993	3.6
1995	2.4
1996	2.8
2002	3.6
2003	3.8
2004	3.6
2005	3.7
2006	3.7
2007	4
2008	4.1
2009	4.3
2010	4.4
2011	4.4
2012	4.4
2013	4.4
2014	4.5
2015	4.2
2016	4.3
2017	4.1
2018	4.2
2019	4.1
2020	4.3