Year	%
1998	6.5
1999	5.5
2000	5.5
2001	5.5
2002	5.5
2003	5.5
2004	5.5
2005	5.5
2006	5.5
2007	5.5
2008	5.5
2009	5.5
2010	5.5
2011	5.5
2012	5.5
2013	5.5
2014	5.5
2015	5.5
2016	5.5
2017	5.5
2018	5.5
2019	5.5
2020	5.5
2021	5.5
2022	5.5
2023	5.5