| Date of Survey |
Instant/Follow-up survey |
Successful Sample |
Response Rate |
| 27-31/1/05 |
Follow-up survey |
1023 |
62.9% |
| 12/1/05 |
Instant survey |
1034 |
66.5% |
| 14-16/1/04 |
Follow-up survey |
1000 |
63.2% |
| 7/1/04 |
Instant survey |
1040 |
67.5% |
| 23-28/1/03 |
Follow-up survey |
1050 |
69.5% |
| 8-9/1/03 |
Instant survey |
1259 |
68.9% |
| 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% |