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Date of Survey	Instant/Follow-up survey	Successful Sample	Response Rate
21-23/10/01	Follow-up survey	1060	65.0%
10/10/01	Instant survey	1051	66.0%
23-25/10/00	Follow-up survey	1031	60.3%
11/10/00	Instant survey	1059	69.7%
22/10/99	Second Follow-up survey	557	49.0%
11,16/10/99	First Follow-up survey	520	47.5%
6/10/99	Instant survey	888	54.5%
20/10/98	Follow-up survey	533	46.4%
7/10/98	Instant survey	1494	56.5%
14-15/10/97	Follow-up survey	517	46.6%
8/10/97	Instant survey	1523	61.5%