July 12, 1971 - November 2, 1971
November 17, 1971 - April 19, 1972
June 12, 1972 - September 12, 1972
October 3, 1972 - February 6, 1973
February 21, 1973 - November 21, 1973
January 8, 1974 - October 1, 1974
November 5, 1974 - May 21, 1975
June 3, 1975 - November 4, 1975
November 19, 1975 - April 6, 1976
April 21, 1976 - September 7, 1976
September 1, 1976 - February 1, 1977
February 16, 1977 - May 18, 1977
June 7, 1977 - September 6, 1977
September 22, 1977 - November 1, 1977
November 16, 1977 - March 7, 1978
September 5, 1978 - November 15, 1978
February 6, 1979 - April 3, 1979