January 18, 1980
June 01, 1986
April 09, 1981
September 25, 1981
March 01, 1983
June 01, 1985
July 01, 1986
January 01, 1987
March 28, 1987
February 01, 1989
March 01, 1989
November 01, 1989
November 01, 1990
December 01, 1989
June 05, 1991
September 05, 1991
October 01, 1990
February 06, 1992