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7-9/3/2012 (Second follow-up Survey) 2-3/2/2012 (First follow-up Survey) 1/2/2012 (Instant survey) 10-16/3/2011 (Second follow-up Survey) 24-25/2/2011 (First follow-up Survey) 23/2/2011 (Instant survey) 23-25/3/2010 (Second follow-up Survey) 25-27/2/2010 (First follow-up Survey) 24/2/2010 (Instant survey) 17-18/3/2009 (Second follow-up Survey) 26/2/2009 (First follow-up Survey) 25/2/2009 (Instant survey) 12-14/3/2008 (Second follow-up Survey) 28/2/2008 (First follow-up Survey) 27/2/2008 (Instant survey) 19-21/3/2007 (Follow-up survey) 28/2/2007 (Instant survey) 13-17/3/2006 (Follow-up survey) 22/2/2006 (Instant survey) 11-14/4/2005 (Follow-up survey) 16/3/2005 (Instant survey) 22-24/3/2004 (Follow-up survey) 10/3/2004 (Instant survey) 12-13/3/2003 (Follow-up survey) 5/3/2003 (Instant survey) 18-20/3/2002 (Follow-up survey) 6/3/2002 (Instant survey) 30-31/3/2001 (Follow-up survey) 7-8/3/2001 (Instant survey) 20/3/2000 (Follow-up survey) 8/3/2000 (Instant survey) 18/3/1999 (Follow-up survey) 3/3/1999 (Instant survey) 24/2/1998 (Follow-up survey) 18/2/1998 (Instant survey)