| Day | Rate | Set date |
|---|---|---|
| 1 August | 20.5500 | .. |
| 2 August | 20.1400 | .. |
| 3 August | 20.1000 | .. |
| 4 August | 20.1400 | .. |
| 5 August | 19.3100 | .. |
| 8 August | 19.4200 | .. |
| 9 August | 19.3000 | .. |
| 10 August | 18.9600 | .. |
| 11 August | 18.6600 | .. |
| 12 August | 18.0500 | .. |
| 15 August | 18.2000 | .. |
| 16 August | 17.7300 | .. |
| 17 August | 18.1100 | .. |
| 18 August | 17.7200 | .. |
| 19 August | 17.5800 | .. |
| 22 August | 16.8700 | .. |
| 23 August | 17.0900 | .. |
| 24 August | 17.4900 | .. |
| 25 August | 17.5200 | .. |
| 26 August | 17.1400 | .. |
| 29 August | 17.6300 | .. |
| 30 August | 17.4500 | .. |
| 31 August | 17.5600 | .. |