1989 April 7 1991 April 27 1991 July 9 1991 July 26 1991 July 27 1993 January 14 1993 January 28 1993 March 5 1993 March 7 1994 February 23 1994 May 22 1996 April 25 1996 July 14 1996 July 23 1999 May 5 2003 September 15 2004 July 19 2005 October 10 2006 March 5 2007 July 15 2009 May 31 2010 July 22 2010 July 22 2010 July 27 2011 November 30 2013 July 25 2013 July 27