| Date | Description | Base Date $m | Current $m | Contractor | Notes | |
| Sep 02 | Original Approved | 455.3 | 455.3 | |||
| May 03 | Real Variation - Transfers | (0.9) | (0.9) | 1 | ||
| Aug 04 | Real Variation -Budgetary Adjustments | (0.8) | (0.8) | 2 | ||
| (1.7) | (1.7) | |||||
| 30 Jun 10 | Price Indexation | 55.5 | ||||
| 30 Jun 10 | Exchange Variation | (51.1) | ||||
| 30 Jun 10 | Total Budget | 453.6 | 458.0 | |||