Year	Percent
1961	12.02186
1962	12.02186
1963	12.02186
1964	12.02186
1965	12.02186
1966	12.02186
1967	12.02186
1968	12.02186
1969	12.02186
1970	12.02186
1971	12.02186
1972	12.02186
1973	12.02186
1974	12.02186
1975	12.02186
1976	12.02186
1977	12.02186
1978	12.02186
1979	12.02186
1980	12.02186
1981	12.02186
1982	12.02186
1983	12.02186
1984	12.02186
1985	12.02186
1986	12.02186
1987	11.74863
1988	11.74863
1989	11.74863
1990	11.74863
1991	11.74863
1992	11.74863
1993	11.74863
1994	11.74863
1995	11.74863
1996	11.74863
1997	11.74863
1998	11.74863
1999	11.74863
2000	12.38836
2001	12.38836
2002	12.96456
2003	12.96456
2004	12.96456
2005	12.96456
2006	12.96456
2007	12.96456
2008	12.96456
2009	12.82051
2010	12.82051
2011	13.10861
2012	13.10861
2013	13.10861
2014	13.10861
2015	13.10861
2016	13.10861
2017	13.39672
2018	13.68482
2019	13.68482
2020	13.97292
2021	13.97292