Year	%
1980	5.3
1986	5.1
1987	4.6
1991	4.8
1992	4.6
1993	4.5
1994	4.4
1995	3.8
1996	3.5
1997	3.5
1998	3.4
1999	3.5
2000	3.2
2001	2.6
2002	2.8
2003	3.3
2004	3.6
2005	3.7
2006	3.9
2007	4.1
2008	4.2
2009	4.3
2010	4.5
2011	4.8
2012	5
2013	5
2014	5
2016	4.9
2017	5
2018	4.9
2019	4.6
2020	4.7
2021	5
2022	5.4