Year	%
1999	16.49
2000	16.49
2001	16.49
2002	16.49
2004	16.05
2005	16.05
2006	16.05
2007	16.05
2008	15.01
2009	15.01
2010	15.01
2011	15.01
2012	16.45
2013	16.45
2014	16.45
2015	16.45
2016	16.45
2018	16.6
2019	16.6
2020	16.6
2021	16.6