Year	%
1998	16.77
1999	16.77
2000	16.77
2001	16.77
2002	16.77
2003	16.32
2004	16.32
2005	16.32
2006	16.32
2007	16.32
2008	16.1
2009	16.1
2010	16.1
2011	16.1
2012	17.2
2013	17.2
2015	17.2
2016	17.2
2019	17.32
2020	17.32
2021	17.32