Year	%
1981	8.3
1986	12.2
1989	9.4
1990	9.5
1991	9.1
1992	9.4
1993	9.2
1994	9.1
1995	9.3
1996	9.1
1997	9.2
1998	9.2
1999	8.8
2000	8.9
2001	7.8
2002	7.8
2003	8.2
2004	8.5
2005	8.7
2006	8.3
2007	8.4
2008	8.5
2009	8
2010	8.5
2011	8.2
2012	8.4
2013	8.2
2014	8.3
2015	8.4
2016	8.3
2017	8.4
2018	8.5
2019	8.4
2020	8.1
2021	8.2
2022	8.6