Year	%
1996	87.11
1997	87.18
1999	87.18
2000	87.18
2001	87.18
2002	86.69
2003	86.69
2004	86.69
2005	86.69
2006	86.69
2007	85.59
2008	85.59
2009	85.59
2010	85.59
2011	85.59
2012	80.03
2013	80.03
2014	80.03
2015	80.03
2016	80.03
2017	80.56
2018	80.56
2019	80.5
2020	80.5
2021	80.5