Year	%
1996	5.51
1997	5.51
1998	5.51
1999	5.51
2000	5.51
2001	5.5
2002	5.5
2003	5.5
2004	5.5
2005	5.6
2006	5.6
2007	5.6
2008	5.6
2010	5.55
2011	5.55
2012	5.59
2013	5.59
2015	5.59
2019	6.51
2021	6.51