Year	Percent
1961	55.31915
1962	55.31915
1963	55.31915
1964	55.31915
1965	55.31915
1966	55.31915
1967	55.31915
1968	55.31915
1969	55.31915
1970	55.31915
1971	53.19149
1972	53.19149
1973	51.06383
1974	51.06383
1975	51.06383
1976	48.93617
1977	48.93617
1978	48.93617
1979	48.93617
1980	48.93617
1981	48.93617
1982	48.93617
1983	48.93617
1984	48.93617
1985	48.93617
1986	48.93617
1987	48.93617
1988	48.93617
1989	48.93617
1990	48.93617
1991	48.93617
1992	48.93617
1993	48.93617
1994	48.93617
1995	48.93617
1996	48.93617
1997	48.93617
1998	48.93617
1999	48.93617
2000	48.93617
2001	48.40426
2002	48.61702
2003	48.6383
2004	48.53191
2005	46.38298
2006	46.34043
2007	44.19149
2008	44.17021
2009	44.19149
2010	42.06383
2011	42.06383
2012	39.91489
2013	40.02128
2014	40
2015	40.02128
2016	40.04255
2017	40.04255
2018	40.07234
2019	40.00021
2020	39.9517
2021	39.90681