| Day | Rate | Set date |
|---|---|---|
| 1 May | 4.6410 | .. |
| 2 May | 4.4830 | .. |
| 3 May | 4.5270 | .. |
| 4 May | 4.4900 | .. |
| 7 May | 4.2390 | .. |
| 8 May | 4.2790 | .. |
| 9 May | 4.2020 | .. |
| 10 May | 4.3480 | .. |
| 11 May | 4.2780 | .. |
| 14 May | 4.3940 | .. |
| 15 May | 4.6530 | .. |
| 16 May | 4.2980 | .. |
| 17 May | 4.2480 | .. |
| 18 May | 4.2910 | .. |
| 21 May | 4.1130 | .. |
| 22 May | 4.1230 | .. |
| 23 May | 4.1130 | .. |
| 24 May | 4.0540 | .. |
| 25 May | 3.9730 | .. |
| 29 May | 3.7380 | .. |
| 30 May | 3.9810 | .. |
| 31 May | 3.9140 | .. |