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Date of Survey | Successful Sample | Response Rate |
6-9/12/2004 | 1007 | 67.8% |
10-14/12/2003 | 1059 | 63.5% |
2-6/12/2002 | 1063 | 64.0% |
13-21/9/2001 | 1025 | 60.5% |
3-9/10/2000 | 1067 | 59.8% |
30/9/1999 | 513 | 65.4% |
3/10/1998 | 530 | 50.0% |
2-3/9/1997 | 683 | 45.7% |