1977 July 16 1977 July 23* 1977 October 8 1977 November 26 1978 January 21 1978 March 4 1978 March 11 1978 March 25 1978 April 22 1978 December 30 1979 January 6 1979 May 19 1979 October 13 1980 January 12 1980 March 8 1980 April 12 1980 May 10 1981 January 10 1981 January 24 1981 March 14 1981 April 4 1981 August 8 1981 September 12 1981 October 24 1982 January 9 1982 January 16 1982 October 9 1983 July 30 1984 May 12 1984 June 30 1985 September 21 1986 February 22 1986 March 8 1986 April 26 1986 September 20 1989 February 11