Year	Percent
1961	34.28571
1962	34.28571
1963	40
1964	45.71429
1965	45.71429
1966	45.71429
1967	42.85714
1968	42.85714
1969	42.85714
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	45.71429
1981	45.71429
1982	42.85714
1983	40
1984	40
1985	34.28571
1986	34.28571
1987	34.28571
1988	31.42857
1989	31.42857
1990	28.57143
1991	28.57143
1992	28.57143
1993	28.57143
1994	25.71429
1995	22.85714
1996	22.85714
1997	22.85714
1998	22.85714
1999	20
2000	20
2001	20
2002	17.14286
2003	17.14286
2004	17.14286
2005	17.14286
2006	11.42857
2007	11.42857
2008	11.42857
2009	11.42857
2010	11.42857
2011	11.42857
2012	11.42857
2013	11.42857
2014	11.42857
2015	11.42857
2016	11.42857
2017	11.42857
2018	9.42857
2019	9.42857
2020	9.42857
2021	9.42857