| Date | Description | Base Date $m | Current $m | Contractor | Notes | |
| May 98 | Original Approved | 1,300.0 | 1,300.0 | |||
| Feb 99 | Real Variation - Transfer | 23.9 | 23.9 | 1 | ||
| Aug 00 | Real Variation - Transfer | 11.3 | 11.3 | 2 | ||
| Jul 01 | Real Variation - Scope | (132.1) | (132.1) | 3 | ||
| Oct 02 | Real Variation - Transfer | (0.2) | (0.2) | 4 | ||
| Oct 03 | Real Variation - Scope Real Variation - Budgetary | 9.3 | 9.3 | 5 | ||
| Aug 04 | Adjustment | (0.7) | (0.7) | 6 | ||
| Aug 04 | Real Variation - Scope | (1.2) | (1.2) | 7 | ||
| Real Variation - Scope Real Variation - Budgetary | (67.0) | (67.0) | 8 | |||
| Aug 05 | Adjustment | (2.7) | (2.7) | 9 | ||
| May 07 | Real Variation - Scope | 412.5 | 412.5 | 10 | ||
| 253.1 | 253.1 | |||||
| Jun 10 | Price Indexation | 314.3 | ||||
| Jun 10 | Exchange Variation | 79.2 | ||||
| Jun 10 | Total Budget | 1,553.1 | 1,946.6 | |||