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| Date of Survey | Successful Sample | Response Rate | Standard Error | 
| 27-30/3/2012 | 1019 | 63.4% | 1.6% | 
| 22-26/2/2007 | 1014 | 60.2% | 1.6% | 
| 12-14/2/2007 | 1013 | 63.5% | 1.6% | 
| 2-7/2/2007 | 1011 | 63.6% | 1.6% | 
| 20-23/6/2005 | 1026 | 61.9% | 1.6% | 
| 6-8/6/2005 | 1029 | 66.0% | 1.6% | 
| 1-3/6/2005 | 1015 | 65.6% | 1.6% | 
| 11/12/1996 | 1301 | 65.3% | 1.4% | 
| 9/12/1996 | 563 | 50.3% | 2.1% | 
| 2/12/1996 | 565 | 57.1% | 2.1% | 
| 25-26/11/1996 | 817 | 50.3% | 1.7% | 
| 18-19/11/1996 | 531 | 47.9% | 2.2% | 
| 11/11/1996 | 576 | 46.4% | 2.1% | 
| 5-6/11/1996 | 522 | 46.0% | 2.2% | 
| 23-24/10/1996 | 526 | 46.5% | 2.2% | 
| 8/10/1996 | 521 | 43.9% | 2.2% | 
| 29-31/8/1996 | 524 | 56.2% | 2.2% | 








