Year	Percent
1961	7.57576
1962	7.57576
1963	7.57576
1964	7.57576
1965	7.57576
1966	7.57576
1967	7.57576
1968	7.57576
1969	7.57576
1970	7.57576
1971	7.57576
1972	7.57576
1973	7.57576
1974	7.57576
1975	7.57576
1976	7.57576
1977	7.57576
1978	7.57576
1979	7.57576
1980	7.57576
1981	7.63187
1982	7.63187
1983	7.63187
1984	7.68799
1985	7.68799
1986	7.74411
1987	7.74411
1988	7.91246
1989	7.91246
1990	7.91246
1991	7.91246
1992	7.91246
1993	7.96857
1994	7.96857
1995	7.96857
1996	8.02469
1997	8.02469
1998	8.02469
1999	8.08081
2000	8.30527
2001	8.47363
2002	8.47363
2003	8.47363
2004	8.41751
2005	8.41751
2006	8.41751
2007	8.47363
2008	8.47363
2009	8.50168
2010	8.52974
2011	8.5578
2012	8.52974
2013	8.61953
2014	8.53535
2015	8.38384
2016	8.41751
2017	8.49607
2018	8.41751
2019	8.41751
2020	8.41751
2021	8.41751