Year	Percent
1961	45.45455
1962	45.45455
1963	45.45455
1964	45.45455
1965	45.45455
1966	45.45455
1967	45.45455
1968	45.45455
1969	44.94949
1970	44.94949
1971	44.94949
1972	44.94949
1973	44.44444
1974	44.44444
1975	44.44444
1976	44.44444
1977	44.44444
1978	43.93939
1979	43.93939
1980	43.93939
1981	43.93939
1982	43.93939
1983	43.43434
1984	43.43434
1985	43.43434
1986	43.43434
1987	43.43434
1988	42.92929
1989	42.92929
1990	42.92929
1991	42.92929
1992	42.92929
1993	42.42424
1994	42.42424
1995	42.42424
1996	42.42424
1997	40.90909
1998	40.40404
1999	39.89899
2000	39.89899
2001	37.87879
2002	37.37374
2003	37.37374
2004	37.87879
2005	38.38384
2006	42.42424
2007	41.41414
2008	40.90909
2009	44.44444
2010	46.0101
2011	48.53535
2012	48.28283
2013	47.77778
2014	48.08081
2015	46.76768
2016	46.91919
2017	46.56566
2018	43.28283
2019	43.28283
2020	43.28283
2021	43.28283