| Day | Rate | Set date |
|---|---|---|
| 1 May | 19.7800 | .. |
| 4 May | 20.3900 | .. |
| 5 May | 24.5600 | .. |
| 6 May | 23.9900 | .. |
| 7 May | 23.5500 | .. |
| 8 May | 24.7400 | .. |
| 11 May | 24.1400 | .. |
| 12 May | 25.7800 | .. |
| 13 May | 25.2900 | .. |
| 14 May | 27.5600 | .. |
| 15 May | 29.4300 | .. |
| 18 May | 31.8200 | .. |
| 19 May | 32.5000 | .. |
| 20 May | 33.4900 | .. |
| 21 May | 33.9200 | .. |
| 22 May | 33.2500 | .. |
| 24 May | 32.9000 | .. |
| 25 May | 33.9200 | .. |
| 26 May | 34.3500 | .. |
| 27 May | 32.8100 | .. |
| 28 May | 33.7100 | .. |
| 29 May | 35.4900 | .. |