| Day | Rate | Set date |
|---|---|---|
| 1 August | 18.9000 | .. |
| 2 August | 18.5100 | .. |
| 3 August | 18.4400 | .. |
| 4 August | 18.4200 | .. |
| 5 August | 17.8600 | .. |
| 8 August | 17.8700 | .. |
| 9 August | 17.8500 | .. |
| 10 August | 17.6700 | .. |
| 11 August | 17.4900 | .. |
| 12 August | 16.9500 | .. |
| 15 August | 16.8700 | .. |
| 16 August | 16.8200 | .. |
| 17 August | 17.0400 | .. |
| 18 August | 16.5500 | .. |
| 19 August | 16.3000 | .. |
| 22 August | 15.7600 | .. |
| 23 August | 15.9500 | .. |
| 24 August | 16.3500 | .. |
| 25 August | 16.3600 | .. |
| 26 August | 16.0400 | .. |
| 30 August | 16.2400 | .. |
| 31 August | 16.2400 | .. |