| Day | Rate | Set date |
|---|---|---|
| 1 May | 72.1800 | .. |
| 2 May | 70.7500 | .. |
| 3 May | 70.8500 | .. |
| 6 May | 71.2400 | .. |
| 7 May | 69.8800 | .. |
| 8 May | 70.3700 | .. |
| 9 May | 70.3900 | .. |
| 10 May | 70.6200 | .. |
| 13 May | 70.2300 | .. |
| 14 May | 71.2400 | .. |
| 15 May | 71.7700 | .. |
| 16 May | 72.6200 | .. |
| 17 May | 72.2100 | .. |
| 20 May | 71.9700 | .. |
| 21 May | 72.1800 | .. |
| 22 May | 70.9900 | .. |
| 23 May | 67.7600 | .. |
| 24 May | 68.6900 | .. |
| 27 May | 70.1100 | .. |
| 28 May | 70.1100 | .. |
| 29 May | 69.4500 | .. |
| 30 May | 66.8700 | .. |
| 31 May | 64.4900 | .. |