Year	Percent
1961	0.999
1962	0.999
1963	0.999
1964	0.999
1965	0.999
1966	0.999
1967	0.999
1968	0.999
1969	0.999
1970	0.999
1971	0.999
1972	0.999
1973	0.999
1974	0.999
1975	0.999
1976	1.0989
1977	1.0989
1978	1.0989
1979	1.0989
1980	1.0989
1981	1.0989
1982	1.0989
1983	1.0989
1984	1.0989
1985	1.0989
1986	1.0989
1987	1.0989
1988	1.0989
1989	1.0989
1990	1.0989
1991	1.0989
1992	1.0989
1993	1.0989
1994	0.999
1995	0.999
1996	0.999
1997	0.999
1998	0.999
1999	0.999
2000	1.0989
2001	1.0989
2002	1.0989
2003	1.0989
2004	1.0989
2005	1.0989
2006	1.0989
2007	1.0989
2008	1.0989
2009	1.0989
2010	1.1988
2011	1.2987
2012	1.2987
2013	1.2987
2014	1.2987
2015	1.2987
2016	1.2987
2017	1.2987
2018	1.2987
2019	1.2987
2020	1.2987
2021	1.2987