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17-20/10/2011 (Second follow-up survey) 13-14/10/2011 (First follow-up survey) 12/10/2011 (Instant survey) 26-27/10/2010 (Second follow-up survey) 14-16/10/2010 (First follow-up survey) 13/10/2010 (Instant survey) 20-26/10/2009 (Second follow-up survey) 15-17/10/2009 (First follow-up survey) 14/10/2009 (Instant survey) 27-29/10/2008 (Second follow-up survey) 17-19/10/2008 (First follow-up survey) 15/10/2008 (Instant survey) 22-23/10/2007 (Follow-up survey) 10/10/2007 (Instant survey) 23-24/10/2006 (Follow-up survey) 11/10/2006 (Instant survey) 25-27/10/2005 (Follow-up survey) 12/10/2005 (Instant survey) 27-31/1/2005 (Follow-up survey) 12/1/2005 (Instant survey) 14-16/1/2004 (Follow-up survey) 7/1/2004 (Instant survey) 23-28/1/2003 (Follow-up survey) 8-9/1/2003 (Instant survey) 21-23/10/2001 (Follow-up survey) 10/10/2001 (Instant survey)