Year	Percent
1961	57.14286
1962	57.14286
1963	57.14286
1964	57.14286
1965	57.14286
1966	57.14286
1967	57.14286
1968	57.14286
1969	51.42857
1970	42.85714
1971	42.85714
1972	42.85714
1973	42.85714
1974	42.85714
1975	42.85714
1976	42.85714
1977	42.85714
1978	42.85714
1979	42.85714
1980	57.69231
1981	57.69231
1982	53.84615
1983	53.84615
1984	50
1985	50
1986	46.15385
1987	46.15385
1988	46.15385
1989	46.15385
1990	46.15385
1991	46.15385
1992	46.15385
1993	46.15385
1994	38.46154
1995	38.46154
1996	34.61538
1997	34.61538
1998	34.61538
1999	38.46154
2000	36.53846
2001	35.76923
2002	31.15385
2003	31.15385
2004	30.88462
2005	19.23077
2006	19.26923
2007	19.57692
2008	19.61538
2009	21.15385
2010	21.92308
2011	23.07692
2012	23.07692
2013	23.07692
2014	23.07692
2015	23.07692
2016	23.07692
2017	23.07692
2018	23.07692
2019	23.07692
2020	23.07692
2021	23.07692