2001 – 2010
after 1998
1996
1995 – 2002
after 1994
1993 – 1996
after 1992
1989 – 1993
1984
1983 – 1989
1981 – 1999
1979 – 1986
1977
after 1976
1970
1968 – 1983
August 1964
April 1961
1961 – 1962
1959 – 1971
after 1957
1950 – 1983
1950 – 1980
1943 – 1960
after 1936
1932 – 1941
1924 – 1931