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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,145,389,323 | 22,958,483 | 22,958,483 |
| 2006 | $4,401,667,999 | 23,413,376 | 23,413,376 |
| 2007 | $6,192,525,463 | 24,819,475 | 24,819,475 |
| 2008 | $8,070,182,472 | 0 | 0 |
| 2009 | $9,530,483,612 | 35,985,022 | 35,985,022 |
| 2010 | $8,382,920,803 | 35,794,360 | 35,794,360 |
| 2011 | $5,095,316,840 | 36,074,891 | 36,074,891 |
Note: Quantity represents Weight in kilograms
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