1978 January 23 1978 May 15 1979 January 22 1980 January 28 1980 September 17 1981 February 9 1982 February 1 1983 February 22 1984 February 28 1984 June 26 1986 November 11 1987 March 3 1989 February 28 1990 February 27 1994 March 1 1995 February 28 1998 October 21 1999 March 2 2003 February 18 2002 May 1 2005 July 25 2007 February 6