Year	%
1994	3.1
1995	3.2
1996	3.4
1997	3.3
1998	3.2
1999	3.5
2000	3.4
2003	3.3
2004	3.4
2005	3.5
2006	3.4
2007	3.1
2008	3
2009	2.8
2010	3.1
2011	2.9
2012	2.8
2013	3.1
2014	3.1
2015	3
2016	2.8
2017	3
2018	2.9
2019	2.9
2020	2.8
2021	2.8