Contact InformationBack
| 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% |







