Year	%
1997	2.95
2001	2.81
2002	2.37
2003	2.37
2005	2.37
2006	2.37
2007	2.37
2008	1.71
2009	1.71
2010	1.71
2011	1.71
2012	1.71
2014	1.71
2016	1.71
2018	1.53
2020	1.53
2021	1.53