| Day | Rate | Set date |
|---|---|---|
| 1 May | 67.0000 | .. |
| 2 May | 66.2500 | .. |
| 3 May | 66.0500 | .. |
| 4 May | 65.3100 | .. |
| 7 May | 64.4400 | .. |
| 8 May | 65.5400 | .. |
| 9 May | 65.2000 | .. |
| 10 May | 65.7900 | .. |
| 11 May | 66.8300 | .. |
| 14 May | 66.8300 | .. |
| 15 May | 68.1100 | .. |
| 16 May | 68.0100 | .. |
| 17 May | 70.2700 | .. |
| 18 May | 69.4200 | .. |
| 21 May | 70.4900 | .. |
| 22 May | 69.5200 | .. |
| 23 May | 70.6000 | .. |
| 24 May | 70.7200 | .. |
| 25 May | 70.6900 | .. |
| 28 May | 69.7100 | .. |
| 29 May | 68.1300 | .. |
| 30 May | 67.8400 | .. |
| 31 May | 68.0400 | .. |