Year	%
1984	3.4
1987	3.9
1990	3.9
1993	3.7
1996	3.5
1998	3.7
1999	3.8
2000	4.1
2001	4.1
2002	3.8
2003	3.7
2004	3.5
2005	3.5
2006	3.3
2007	3.2
2008	3.3
2009	3.4
2010	3.2
2011	3
2012	3
2013	3
2014	3
2015	2.9
2016	2.9
2017	2.8
2018	2.8
2019	3
2020	3
2021	2.9
2022	3.1
2023	3.1