1978 July 14 1978 November 9 1978 December 5 1978 December 8 1979 April 6 1980 April 11 1982 June 1 1984 April 25 1984 May 23 1984 May 30 1986 April 5 1986 April 13 1987 November 12 1987 November 15 1991 August 29 1991 September 23 2004 September 4 2013 January 18