Year	Percent
1961	48.76847
1962	49.26108
1963	49.26108
1964	49.26108
1965	49.75369
1966	48.76847
1967	51.72414
1968	54.6798
1969	54.6798
1970	55.17241
1971	55.17241
1972	55.66502
1973	55.66502
1974	55.66502
1975	55.66502
1976	56.15764
1977	56.15764
1978	56.15764
1979	56.15764
1980	56.15764
1981	56.15764
1982	56.15764
1983	56.15764
1984	56.15764
1985	56.15764
1986	56.15764
1987	56.15764
1988	55.66502
1989	55.17241
1990	54.6798
1991	54.18719
1992	53.69458
1993	52.70936
1994	51.72414
1995	51.23153
1996	50.73892
1997	50.24631
1998	50.24631
1999	49.26108
2000	49.75369
2001	50.24631
2002	49.26108
2003	48.76847
2004	48.27586
2005	47.29064
2006	46.30542
2007	45.3202
2008	44.82759
2009	44.82759
2010	44.82759
2011	44.56685
2012	43.56535
2013	43.0646
2014	43.0646
2015	43.0646
2016	43.0646
2017	43.0646
2018	43.0646
2019	43.0646
2020	43.0646
2021	43.0646