August 27-November 13, 1938
March 24-December 30, 1939
August 8, 1940-December 26, 1941
December 26, 1941-December 26, 1942
December 26,1942-December 31, 1943
December 31, 1943-December 29, 1944
December 30, 1944-March 17, 1946
March 18-December 7, 1946
July 2, 1948-July 29, 1949
July 29-December 31, 1949
December 31, 1949-July 1, 1950
July 1-December 5, 1950
December 6, 1950-December 11, 1951
December 12, 1951-April 24, 1952
April 24, 1952-June 4, 1953
June 5, 1953-July 23, 1954
July 24, 1954-January 4, 1955
January 5, 1955-August 27, 1956
August 28, 1956-July 15, 1959
July 16, 1959-August 11, 1962
August 12, 1962-June 26, 1964
June 27, 1964-July 28, 1966
July 29, 1966-March 16, 1968
March 17, 1968-April 17, 1971
April 18, 1971-July 28, 1972
July 29, 1972-July 27, 1974
July 28-December 31, 1974
December 31, 1974-December 31, 1975
December 31, 1975-June 2, 1976