Year	%
1996	19.04
1997	19.2
1999	19.2
2000	19.2
2001	19.2
2002	19.06
2003	19.06
2004	19.06
2005	19.06
2006	19.06
2007	19.09
2008	19.09
2009	19.09
2010	19.09
2011	19.09
2012	19.27
2013	19.27
2014	19.27
2015	19.27
2016	19.27
2017	19.35
2018	19.35
2019	19.35
2020	19.35
2021	19.35