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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $170,917,654 | 2,430,841,709 | 2,430,841,709 |
| 2006 | $205,072,139 | 3,175,463,038 | 3,175,463,038 |
| 2007 | $274,184,287 | 3,082,708,643 | 3,082,708,643 |
| 2008 | $599,287,340 | 3,631,873,726 | 3,631,873,726 |
| 2009 | $451,091,850 | 3,320,610,210 | 3,320,610,210 |
| 2010 | $357,248,947 | 3,475,487,253 | 3,475,487,253 |
| 2011 | $275,267,398 | 2,000,764,970 | 2,000,764,970 |
Note: Quantity represents Weight in kilograms
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