Year	Percent
1961	6.90865
1962	6.90865
1963	6.90865
1964	6.90865
1965	6.90865
1966	6.93407
1967	6.93407
1968	6.94423
1969	6.94423
1970	6.96965
1971	6.96965
1972	6.9849
1973	6.99507
1974	6.99507
1975	7.00025
1976	6.75256
1977	6.50487
1978	6.25718
1979	6.00948
1980	5.76179
1981	5.5141
1982	5.2664
1983	5.01871
1984	5.04343
1985	5.05292
1986	5.07256
1987	5.08204
1988	5.09153
1989	5.11117
1990	5.12065
1991	5.13013
1992	5.13962
1993	5.1491
1994	5.15858
1995	5.17822
1996	5.19279
1997	5.20227
1998	5.21175
1999	5.22123
2000	5.2358
2001	5.25544
2002	5.26492
2003	5.27441
2004	5.28389
2005	5.29337
2006	5.29337
2007	5.29337
2008	5.29337
2009	5.29337
2010	5.29337
2011	5.29337
2012	5.29337
2013	5.29337
2014	5.29337
2015	5.29337
2016	5.29337
2017	5.29337
2018	5.29337
2019	5.29337
2020	5.29337
2021	5.29845