1978 July 9 1978 December 4 1982 May 13 1982 May 27 1982 June 3 1982 August 2 1983 October 10 1984 May 23 1986 April 14 2003 September 20 2004 November 26 2006 January 15 2006 January 26 2008 May 9 2009 September 25 2009 October 17 2011 April 21 2013 September 14