2005 Historical Data
| 6 December | 42.76% | 22 November | 43.40% |
| 8 November | 43.00% |
| 1 November | 42.50% |
| 25 October | 42.98% |
| 18 October | 44.74% |
| 11 October | 42.64% |
| 4 October | 43.49% |
| 27 September | 43.63% |
| 20 September | 43.91% |
| 13 September | 45.40% |
| 22 August | 45.12% |
| 16 August | 46.32% | 26 July | 45.46% |
| 12 July | 47.25% |
| 5 July | 47.33% |
| 22 June | 47.32% |
| 14 June | 47.62% |
| 7 June | 47.04% |
| 31 May | 46.70% |
| 24 May | 46.57% |
| 10 May | 48.85% |
| 3 May | 49.16% |
| 26 April | 49.51% |
| 12 April | 51.1% |
| 29 March | 50.08% |
| 22 March | 50.00% |
| 15 March | 50.67% |
| 8 March | 49.81% |
| 1 March | 49.58% |
| 22 February | 50.58% |
| 16 February | 50.60% |
| 25 January | 49.51% |
| 18 January | 49.03% |
| 4 January | 49.36% |
