Year	%
1991	7.5
1992	7.2
1993	6.7
1994	8.7
1995	8.7
1996	7.5
1997	8.2
1998	7.7
1999	7.7
2000	8
2001	8
2002	8
2003	8.5
2004	8.5
2005	8.7
2006	8.7
2007	8.5
2008	8.5
2009	9.2
2010	8.7
2011	8.7
2012	9.7
2013	9.5
2014	10.5
2015	10.5
2016	11
2017	11.5
2018	10.2
2019	10.7