Year	%
1989	2.8
1990	2.8
1991	3.7
1992	3.9
1993	3.6
1994	3.1
1995	3.1
1996	2.9
1997	3.5
1998	2.1
1999	2.3
2001	2.5
2002	2.6
2003	2.3
2004	2.3
2005	1.9
2006	2.1
2007	2.8
2008	2.7
2009	3.3
2010	3.1
2011	3
2012	3
2013	3.5
2014	3.7
2015	3.7
2016	3.2
2017	3.4
2018	3.4
2019	3.6