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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $54,325,000 | 1,520,645,056 | 1,520,645,056 |
| 2006 | $22,551,000 | 631,680,672 | 631,680,672 |
| 2007 | $22,063,000 | 343,578,992 | 343,578,992 |
| 2008 | $141,826,000 | 2,803,845,749 | 2,803,845,749 |
| 2009 | $65,465,000 | 565,235,468 | 565,235,468 |
| 2010 | $81,526,000 | 901,837,142 | 901,837,142 |
| 2011 | $95,998,000 | 653,452,626 | 653,452,626 |
Note: Quantity represents Weight in kilograms
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