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| Year | Trade Value | Weight (kg) | Quantity |
| 2008 | $1,580,260,006 | 3,539,983,605 | 3,539,983,605 |
| 2009 | $718,077,225 | 2,109,624,000 | 2,109,624,000 |
| 2010 | $1,001,958,763 | 2,330,133,024 | 2,330,133,024 |
| 2011 | $1,658,391,340 | 2,729,153,000 | 2,729,153,000 |
Note: Quantity represents Weight in kilograms
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