1977 March 26 1977 July 23 1977 August 6 1977 August 20 1977 August 27 1978 January 7 1978 March 11 1978 March 18 1978 March 25 1978 December 9 1979 January 6 1979 January 27 1979 February 3 1979 April 7 1979 June 9 1980 March 8 1980 June 14 1981 August 8 1983 May 28 1983 July 9 1985 May 18 1986 March 1 1986 September 13 1986 November 29 1987 January 31 1987 February 7 1989 February 11 1989 February 18 1993 January 23 1994 March 5 1995 May 20 1996 June 29 1998 May 2 1998 October 3 1998 October 10 1998 November 14 1999 May 1 2000 May 3 2000 November 3 2001 March 8 2001 March 23 2001 March 28 2002 April 18