Era
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Since 1918
4
Since 1945
56
Since 1946
1
Since 1947
3
Since 1948
1
Since 1949
2
Since 1952
2
Since 1958
2
Since 1959
1
Since 1960
5
Since 1963
1
Since 1965
1
Since 1966
1
Since 1968
2
Since 1969
1
Since 1970
6
Since 1971
4
Since 1972
2
Since 1973
1
Since 1974
2
Since 1975
2
Since 1976
6
Since 1979
2
Since 1981
8
Since 1982
5
Since 1983
2
Since 1985
4
Since 1986
4
Since 1988
2
Since 1989
10
Since 1990
8
Since 1991
18
Since 1992
1
Since 1993
2
Since 1997
1
Since 2000
2
Since 2001
1
Since 2002
1