Year	%
1996	33.1
1997	33.1
1998	33.1
1999	33.1
2000	33.1
2001	33.1
2002	33.1
2003	33.1
2004	33.1
2005	32.94
2006	32.94
2007	33
2008	33
2010	33
2011	33
2012	32.97
2013	32.97
2015	32.97
2016	32.97
2017	33.04
2018	33.04
2020	33.04
2021	33.04