| Day | Rate | Set date |
|---|---|---|
| 1 May | 21.2500 | .. |
| 2 May | 21.1700 | .. |
| 3 May | 21.3700 | .. |
| 6 May | 21.6800 | .. |
| 7 May | 21.6300 | .. |
| 8 May | 21.7800 | .. |
| 9 May | 21.9300 | .. |
| 10 May | 21.2700 | .. |
| 13 May | 20.9100 | .. |
| 14 May | 20.7400 | .. |
| 15 May | 20.9200 | .. |
| 16 May | 20.8900 | .. |
| 17 May | 21.1800 | .. |
| 20 May | 21.3700 | .. |
| 21 May | 21.4000 | .. |
| 22 May | 20.8300 | .. |
| 23 May | 21.0200 | .. |
| 24 May | 21.1900 | .. |
| 28 May | 21.3300 | .. |
| 29 May | 21.1100 | .. |
| 30 May | 21.3200 | .. |
| 31 May | 21.1300 | .. |