Year	Percent
1990	41.43
1991	41.43
1992	41.43
1993	41.43
1994	41.43
1995	41.43
1996	41.5
1997	41.5
1998	41.5
1999	41.5
2000	41.5
2001	41.5
2002	41.5
2003	41.5
2004	41.5
2005	41.5
2006	41.5
2007	41.5
2008	41.57
2009	41.57
2010	41.57
2011	41.57
2012	41.57
2013	41.64
2014	41.64
2015	41.64