Year	%
1979	6.7
1986	6.5
1992	6.9
1997	6.1
2001	5.9
2002	5.5
2003	5.2
2004	4.8
2005	4.8
2006	4.8
2007	5
2008	4.8
2009	4.6
2010	4.7
2011	4.8
2012	4.8
2013	5.1
2014	5
2015	5
2016	5.1
2017	5.1
2018	5.2
2019	5.2
2020	5.4
2021	5.5