Year	%
1970	7
1975	7.1
1979	7.4
1984	7.5
1990	7.9
1996	7.5
1997	7.6
1998	7.8
1999	7.7
2000	7.6
2001	7.7
2002	8
2003	8.2
2004	8.4
2005	8.6
2006	8.5
2007	8.1
2008	7.9
2009	7.7
2010	7.7
2011	7.8
2012	7.8
2013	8
2014	8
2015	7.9
2016	8
2017	8.1
2018	8
2019	7.8
2020	8
2021	7.7