Year	%
1996	27.82
1997	27.82
1998	27.82
1999	27.82
2000	27.82
2001	27.82
2002	27.82
2003	26.38
2004	26.38
2005	26.38
2006	26.38
2007	26.38
2008	26.38
2009	24.12
2010	24.12
2011	24.12
2012	24.12
2013	24.12
2015	23.54
2016	23.54
2017	23.54
2019	23.55
2020	23.55
2021	23.55