1977 October 3 1978 March 1981 January 24 1981 June 26 1981 June 6 1981 July 23 1982 February 18 1983 June 10 1983 November 11 1984 December 14 1986 March 27 1987 July 16 1989 February 23 1991 July 11 2002 September 5