1978 June 23 1978 June 24 1979 May 26 1980 March 12 1981 February 14 1982 April 3 1982 April 21 1984 July 18 1986 March 22 1986 June 7 1986 July 7 1986 October 18 1989 February 11 1989 March 7 1989 March 11 1990 March 26 1991 May 18 1991 May 25 1991 July 23 1993 January 23 1993 January 30 1993 March 3 1994 March 5 1994 March 11 1994 June 7 1994 July 22 1994 July 25 1995 May 13 1996 May 14 1996 July 1 1998 September 25 1998 October 8 1999 October 9 2002 April 15 2003 October 2 2005 January 22 2005 January 26