Year	%
1997	39.37
1999	39.37
2000	39.09
2001	39.09
2002	39.09
2003	39.09
2004	39.09
2005	39.09
2006	39.09
2007	43.08
2008	43.91
2009	43.85
2010	44.85
2012	45.66
2013	46.05
2018	41.25
2019	41.25
2020	41.25
2021	41.25