Investor relations
The Company
Corporate Governance
Financial Information & Statistics
Annual Report and 20-F
Registration and Requirements
Quarterly Results
| Period | Press Release | Webcast | Presentation |
| 1Q 2012 Results |
 |
 |
|
Historical
| Cumulative as of 1Q 2012 | |
| Operating Statistics |
 |
| Financial information |
|
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