Year	%
1993	8.12
1996	7.64
1997	7.67
1998	7.64
1999	7.62
2000	7.62
2001	8.22
2002	7.61
2003	8.26
2004	8.25
2005	8.25
2006	8.24
2007	8.1
2008	8.1
2009	8.19
2010	8.19
2011	8.19
2012	8.19
2013	8
2015	7.96
2016	7.95
2017	7.95
2019	7.99
2020	7.99
2021	7.99