| Date | Description | Base Date $m | Current $m | Contractor | Notes | |
| Apr 04 | Original Approved | 3.3 | 3.3 | 1 | ||
| Aug 04 | Government Second Pass Approval | 953.9 | 953.9 | |||
| Jun 06 Oct 06 | Real Variation - Scope Real Variation - Transfers | 2,565.6 (219.0) | 2,565.6 (219.0) | 2 3 | ||
| Oct 08 Oct 08 | Real Variation - Transfers Real Variation - Scope | (20.0) 31.5 | (20.0) 31.5 | 4 5 | ||
| 3,312.0 | 3,312.0 | |||||
| Jun 10 Jun 10 Jun 10 | Price Indexation Exchange Variation Total Budget | 556.1 (116.8) | ||||
| 3,315.3 | 3,754.6 | |||||