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Date of Survey	Instant/First follow-up survey/Second follow-up survey	Successful Sample	Response Rate	Standard Error
10-16/3/2011	Second follow-up survey	1009	65.6%	1.6%
24-25/2/2011	First follow-up survey	515	72.6%	2.2%
23/2/2011	Instant survey	1031	72.8%	1.6%
23-25/3/2010	Second follow-up survey	1012	69.3%	1.6%
25-27/2/2010	First follow-up survey	517	67.1%	2.2%
24/2/2010	Instant survey	1008	65.9%	1.6%
17-18/3/2009	Second follow-up survey	1007	63.3%	1.6%
26/2/2009	First follow-up survey	525	66.5%	2.2%
25/2/2009	Instant survey	1015	67.7%	1.6%
12-14/3/2008	Second follow-up survey	1017	65.8%	1.6%
28/2/2008	First follow-up survey	525	70.1%	2.2%
27/2/2008	Instant survey	1077	75.5%	1.5%
19-21/3/2007	Follow-up survey	1007	63.6%	1.6%
28/2/2007	Instant survey	1018	65.2%	1.6%
13-17/3/2006	Follow-up survey	1010	59.4%	1.6%
22/2/2006	Instant survey	1026	68.3%	1.6%
11-14/4/2005	Follow-up survey	1009	62.8%	1.6%
16/3/2005	Instant survey	1041	65.2%	1.5%
22-24/3/2004	Follow-up survey	1015	67.8%	1.6%
10/3/2004	Instant survey	1023	64.7%	1.6%
12-13/3/2003	Follow-up survey	1040	72.3%	1.6%
5/3/2003	Instant survey	1047	71.4%	1.5%
18-20/3/2002	Follow-up survey	1216	60.1%	1.4%
6/3/2002	Instant survey	1041	59.9%	1.5%
30-31/3/2001	Follow-up survey	511	73.3%	2.2%
7-8/3/2001	Instant survey	502	67.1%	2.2%
20/3/2000	Follow-up survey	660	56.7%	2.0%
8/3/2000	Instant survey	856	56.4%	1.7%
18/3/1999	Follow-up survey	530	55.4%	2.2%
3/3/1999	Instant survey	1190	62.1%	1.4%
24/2/1998	Follow-up survey	538	56.7%	2.2%
18/2/1998	Instant survey	804	54.7%	1.8%