June 27, 1980
July 04, 1980
July 18, 1980
July 01, 1985
August 21, 1981
May 15, 1981
February 12, 1982
January 01, 1985
September 01, 1990
September 01, 1989
January 01, 1986
June 01, 1986
June 01, 1987
