1980

July 1, 1980 August 1980 September  1980 November 1980 December 1980

1981

February 1981 March 1980 April 1981 May 1981 July, 1981 September 1981 July 1, 1980 December 1981

1982

January 1982 March 1982 April 1982 May 1982 June 1982 July 1982 August 1982 September 1982 October 1982 December 1982

1984

April 1984 May 1984 June 1984

1986

February 1986 August 1986

1987

January 1987 March 1987 April 1987 May 1987 June 1987 July 1987 August 1987 September 1987

1988

October 1988 December 1988

1989

January 1989