Year	%
1996	2.3
1997	1.8
1998	1.7
1999	1.9
2000	1.8
2001	2
2002	2.3
2003	2.3
2004	2.3
2005	2.3
2006	2.3
2007	2.3
2008	2.3
2009	2.3
2010	2.1
2011	2
2012	2.2
2013	2.3
2014	2.4
2015	2.6
2016	2.6
2017	2.3
2018	2.4
2019	2.6
2020	2.7
2021	2.7