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| Year | Trade Value | Weight (kg) | Quantity |
| 2006 | $1,279,029,998 | 13,098,110,603 | 13,098,110,603 |
| 2007 | $1,827,604,054 | 9,729,482,499 | 9,729,482,499 |
| 2008 | $628,928,688 | 2,274,056,901 | 2,274,056,901 |
| 2009 | $1,059,775,258 | 1,217,891,939 | 1,217,891,939 |
| 2010 | $795,319,505 | 1,372,168,467 | 1,372,168,467 |
Note: Quantity represents Weight in kilograms
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