Year	%
1989	5.9
1990	6.3
1991	7.7
1992	7.8
1993	7.4
1994	7
1995	6.8
1996	6.8
1997	7.4
1998	6.4
1999	6.8
2001	6.4
2002	6.5
2003	5.9
2004	5.9
2005	5.6
2006	6
2007	6.5
2008	6.7
2009	7.5
2010	7.1
2011	7.3
2012	7
2013	7.8
2014	7.7
2015	7.9
2016	7.7
2017	8
2018	8
2019	8