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Date of Survey	Instant/Follow-up survey	Successful Sample	Response Rate
17-20/10/2011	Second follow-up survey	518	73.9%
13-14/10/2011	Follow-up survey	520	65.5%
12/10/2011	Instant survey	1032	65.6%
26-27/10/2010	Second follow-up survey	523	64.0%
14-16/10/2010	Follow-up survey	507	64.9%
13/10/2010	Instant survey	1020	66.9%
20-26/10/2009	Second follow-up survey	513	72.1%
15-17/10/2009	Follow-up survey	508	70.6%
14/10/2009	Instant survey	1007	71.9%
27-29/10/2008	Second follow-up survey	1015	70.3%
17-19/10/2008	Follow-up survey	505	70.9%
15/10/2008	Instant survey	1011	74.9%
22-23/10/2007	Follow-up survey	526	67.2%
10/10/2007	Instant survey	1023	69.9%
23-24/10/2006	Follow-up survey	507	61.8%
11/10/2006	Instant survey	1027	60.7%
25-27/10/2005	Follow-up survey	513	65.4%
12/10/2005	Instant survey	914	66.1%
27-31/1/2005	Follow-up survey	1023	62.9%
12/1/2005	Instant survey	1034	66.5%
14-16/1/2004	Follow-up survey	1000	63.2%
7/1/2004	Instant survey	1040	67.5%
23-28/1/2003	Follow-up survey	1050	69.5%
8-9/1/2003	Instant survey	1259	68.9%
21-23/10/2001	Follow-up survey	1060	65.0%
10/10/2001	Instant survey	1051	66.0%
23-25/10/2000	Follow-up survey	1031	60.3%
11/10/2000	Instant survey	1059	69.7%
22/10/1999	Second Follow-up survey	557	49.0%
11,16/10/1999	First Follow-up survey	520	47.5%
6/10/1999	Instant survey	888	54.5%
20/10/1998	Follow-up survey	533	46.4%
7/10/1998	Instant survey	14/1994	56.5%
14-15/10/1997	Follow-up survey	517	46.6%
8/10/1997	Instant survey	1523	61.5%
2/10/1996	Instant survey	511	65.1%
11/10/1995	Instant survey	805	62.0%
5/10//1994	Instant survey	1716	72.7%
6/10/1993	Instant survey	980	59.7%
7-8/10/1992	Instant survey	1376	72.6%