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Exhibit 6.1

Computation of Earnings Per Share

|                                                |                                              |   |                                                     |   |      |   |             |   |  |   |             |   | 
|----------------------------------------------- | -------------------------------------------- | - | --------------------------------------------------- | - | ---- | - | ----------- | - |  | - | ----------- | - | 
|                                                |                                              |   | For the year ended December 31,                    
|                                                |                                              |   |                                                    
|                                                |                                              |   | 2000                                                |   | 2001 |   | 2002       
|                                                |                                              |   |                                                     |   |      |   |            
|                                                |                                              |   | (US$ in thousands, except share and per share data)
|                                               
|Net income                                      |                                              | $ | 504,890                                             |   |      | $ | 498,983     |   |  | $ | 274,140     |  
|                                                |                                              |   |                                                     |   |      |   |             |   |  |   |             |  
|                                               
|Weighted average ordinary shares outstanding    |                                              |   | 166,666,755                                         |   |      |   | 166,666,755 |   |  |   | 164,893,283 |  
|Ordinary share equivalents:                     |                                              |   |                                                     |   |      |   |             |   |  |   |             |  
|                                                | Dilutive effect of share options
outstanding |   |                                                     |  |      |   |             | * |  |   |             | * | 
|                                                |                                              |   |                                                     |   |      |   |             |   |  |   |             |  
|Weighted average ordinary shares
outstanding    |                                              |   | 166,666,755                                         |   |      |   | 166,666,755 |   |  |   | 164,893,283 |  
|                                                |                                              |   |                                                     |   |      |   |             |   |  |   |             |  
|                                               
|Basic and diluted net income per ordinary share |                                              | $ | 3.03                                                |   |      | $ | 2.99        |   |  | $ | 1.66        |  
|                                                |                                              |   |                                                     |   |      |   |             |   |  |   |             |  



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|* |  | The dilutive effect of share options outstanding during the years ended
December 31, 2001 and 2002 was not material.
|- |  | --------------------------------------------------------------------------------------------------------------------