Year | Value | 2021 | 60 | 2020 | 60 | 2019 | 60 | 2018 | 60 | 2017 | 60 | 2016 | 60 | 2015 | 60 | 2014 | 60 | 2013 | 60 | 2012 | 60 | 2011 | 60 | 2010 | 60 | 2009 | 60 | 2008 | 60 | 2007 | 60 | 2006 | 60 | 2005 | 60 | 2004 | 60 | 2003 | 60 | 2002 | 60 | 2001 | 60 | 2000 | 60 | 1999 | 60 | 1998 | 60 | 1997 | 60 | 1996 | 60 | 1995 | 60 | 1994 | 60 | 1993 | 60 | 1992 | 60 | 1991 | 60 | 1990 | 60 | 1989 | 60 | 1988 | 60 | 1987 | 60 | 1986 | 60 | 1985 | 60 | 1984 | 60 | 1983 | 60 | 1982 | 60 | 1981 | 60 | 1980 | 60 | 1979 | 60 | 1978 | 60 | 1977 | 60 | 1976 | 60 | 1975 | 60 | 1974 | 60 | 1973 | 60 | 1972 | 60 | 1971 | 60 | 1970 | 60 | 1969 | 60 | 1968 | 60 | 1967 | 60 | 1966 | 60 | 1965 | 60 | 1964 | 60 | 1963 | 60 | 1962 | 60 | 1961 | 60 |
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