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Date of Survey	Instant/Follow-up survey	Successful Sample	Response Rate	Standard Error
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%	1.8%
24/2/1998	Follow-up survey	538	56.7%	2.2%
18/2/1998	Instant survey	804	54.7%	1.8%