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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,164,752,018 | 14,313,621,765 | 14,313,621,765 |
| 2006 | $6,894,527,813 | 19,191,541,991 | 19,191,541,991 |
| 2007 | $8,905,065,606 | 21,973,800,877 | 21,973,800,877 |
| 2008 | $13,682,759,497 | 22,587,812,852 | 22,587,812,852 |
| 2009 | $9,351,031,046 | 27,367,419,541 | 27,367,419,541 |
| 2010 | $16,293,417,491 | 32,928,361,003 | 32,928,361,003 |
| 2011 | $21,603,315,936 | 31,257,644,693 | 31,257,644,693 |
Note: Quantity represents Weight in kilograms
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