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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $143,748,000 | 576,504,700 | 576,504,700 |
| 2006 | $152,553,000 | 569,304,700 | 569,304,700 |
| 2007 | $212,604,000 | 604,804,945 | 604,804,945 |
| 2008 | $300,528,000 | 589,313,400 | 589,313,400 |
| 2009 | $234,833,000 | 786,079,547 | 786,079,547 |
| 2010 | $200,025,834 | 622,625,473 | 622,625,473 |
| 2011 | $341,242,940 | 773,891,867 | 773,891,867 |
Note: Quantity represents Weight in kilograms
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