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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,887,135,950 | 2,704,736,805 | 2,704,736,805 |
| 2006 | $2,354,970,812 | 3,193,294,552 | 3,193,294,552 |
| 2007 | $3,050,737,138 | 3,484,114,301 | 3,484,114,301 |
| 2008 | $2,940,867,564 | 3,166,191,280 | 3,166,191,280 |
| 2009 | $2,112,314,824 | 2,337,617,382 | 2,337,617,382 |
| 2010 | $2,260,614,142 | 2,602,628,731 | 2,602,628,731 |
| 2011 | $2,729,814,572 | 2,740,759,487 | 2,740,759,487 |
Note: Quantity represents Weight in kilograms
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