August 15, 1980 to May 13, 1981
July 15, 1980 to June 21, 1982
July 14, 1980 to March 6, 1981
June 19, 1980 to March 18, 1981
June 16, 1980 to July 14, 1980
May 22, 1980 to October 8, 1980
18 May 1980 to 15 June 1980
May 18, 1980 to October 13, 1981
May 18, 1980 to February 15, 1981
May 9, 1980 to March 6, 1981
