Year	Percent
1961	1.96499
1962	1.96499
1963	1.96499
1964	1.96499
1965	1.96499
1966	1.96499
1967	1.96499
1968	1.96499
1969	1.96499
1970	1.96499
1971	1.96499
1972	1.96499
1973	1.96499
1974	1.96499
1975	1.96499
1976	1.96499
1977	2.00071
1978	2.03644
1979	2.1079
1980	2.1079
1981	2.1079
1982	2.21508
1983	2.21508
1984	2.28653
1985	2.28653
1986	2.35798
1987	2.32226
1988	2.39371
1989	2.42944
1990	2.42944
1991	2.46517
1992	2.53662
1993	2.53662
1994	2.57235
1995	2.60807
1996	2.60807
1997	2.60807
1998	2.6438
1999	2.71526
2000	2.71526
2001	2.75098
2002	2.82244
2003	2.96534
2004	3.00107
2005	3.25116
2006	3.39407
2007	3.4298
2008	3.53698
2009	3.64416
2010	3.85852
2011	3.9657
2012	4.03716
2013	4.03716
2014	4.09075
2015	4.14434
2016	4.18006
2017	4.28725
2018	4.28725
2019	4.28725
2020	4.28725
2021	4.28725