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