1977 September 1977 October 1977 November 1977 December 1978 May 1978 June 1979 January 1979 February 1979 April 1979 June 1979 August 1980 April 1980 May 1980 November 1981 May 1982 February 1982 October 1982 December 1983 November 1984 April