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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,600,512,730 | 14,578,530,000 | 14,578,530,000 |
| 2006 | $4,403,624,810 | 10,650,180,000 | 10,650,180,000 |
| 2007 | $4,553,511,190 | 9,809,625,950 | 9,809,625,950 |
| 2008 | $4,513,656,370 | 6,583,376,076 | 6,583,376,076 |
| 2009 | $2,989,638,650 | 7,182,285,000 | 7,182,285,000 |
| 2010 | $4,171,265,170 | 7,787,950,778 | 7,787,950,778 |
| 2011 | $4,272,365,660 | 5,679,425,171 | 5,679,425,171 |
Note: Quantity represents Weight in kilograms
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