Year	Percent
1961	56.12597
1962	56.12597
1963	56.12597
1964	56.12597
1965	56.12597
1966	56.12597
1967	56.12597
1968	56.12597
1969	56.12597
1970	56.12597
1971	56.12597
1972	56.12597
1973	56.12597
1974	56.12597
1975	56.12597
1976	56.12597
1977	56.12597
1978	56.12597
1979	56.12597
1980	56.12597
1981	56.12597
1982	56.12597
1983	56.12597
1984	56.12597
1985	56.12597
1986	56.12597
1987	56.12597
1988	56.12597
1989	56.12597
1990	56.03969
1991	57.65746
1992	59.16739
1993	60.4616
1994	60.4616
1995	62.62295
1996	63.91717
1997	64.77998
1998	64.77998
1999	66.93701
2000	69.09405
2001	72.5453
2002	73.40811
2003	73.41242
2004	73.41242
2005	73.41242
2006	73.42537
2007	73.43399
2008	73.42105
2009	73.42537
2010	73.43831
2011	73.45988
2012	73.45988
2013	73.45988
2014	73.45988
2015	73.45988
2016	73.45988
2017	73.45988
2018	73.45988
2019	73.46419
2020	73.50733
2021	73.50733