Year	%
1997	83.6
2001	83.15
2002	81.32
2003	81.32
2005	81.32
2006	81.32
2007	81.32
2008	73.11
2009	73.11
2010	73.11
2011	73.11
2012	73.11
2014	73.11
2016	73.11
2018	69.4
2020	69.4
2021	69.4