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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $905,560,381 | 3,855,645,091 | 3,855,645,091 |
| 2006 | $833,957,028 | 3,429,242,232 | 3,429,242,232 |
| 2007 | $900,105,086 | 3,062,639,540 | 3,062,639,540 |
| 2008 | $1,613,817,629 | 3,813,671,172 | 3,813,671,172 |
| 2009 | $1,430,168,697 | 3,501,043,684 | 3,501,043,684 |
| 2010 | $1,671,947,525 | 4,209,857,961 | 4,209,857,961 |
Note: Quantity represents Weight in kilograms
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