| Day | Rate | Set date |
|---|---|---|
| 1 May | 67.2500 | .. |
| 2 May | 67.9300 | .. |
| 3 May | 68.4300 | .. |
| 4 May | 69.7200 | .. |
| 7 May | 70.7300 | .. |
| 8 May | 69.0600 | .. |
| 9 May | 71.1400 | .. |
| 10 May | 71.3600 | .. |
| 11 May | 70.7000 | .. |
| 14 May | 70.9600 | .. |
| 15 May | 71.3100 | .. |
| 16 May | 71.4900 | .. |
| 17 May | 71.4900 | .. |
| 18 May | 71.2800 | .. |
| 21 May | 72.2400 | .. |
| 22 May | 72.1300 | .. |
| 23 May | 71.8400 | .. |
| 24 May | 70.7100 | .. |
| 25 May | 67.8800 | .. |
| 27 May | 67.3600 | .. |
| 28 May | 67.0500 | .. |
| 29 May | 66.7300 | .. |
| 30 May | 68.2100 | .. |
| 31 May | 67.0400 | .. |