| Date | Description | Base Date $m | Current $m | Contractor | Notes | |
| Sep 00 | Original Approved | 72.0 | 72.0 | |||
| Apr 01 | Real Variation – Transfers | 3.7 | 3.7 | 1 | ||
| Jul 01 | Real Variation – Scope | 302.8 | 302.8 | 2 | ||
| Sep 02 | Real Variation – Transfers | (42.0) | (42.0) | 3 | ||
| Aug 04 | Real Variation – Budgetary Adjustments | (0.3) | (0.3) | 4 | ||
| Aug 05 | Real Variation – Budgetary Adjustments | (0.5) | (0.5) | 5 | ||
| Oct 06 | Real Variation – Scope | 7.5 | 7.5 | 6 | ||
| 271.2 | 271.2 | |||||
| Jun 10 | Price Indexation | 66.8 | ||||
| Jun 10 | Exchange Variation | (2.3) | ||||
| Jun 10 | Total Budget | 343.2 | 407.7 | |||