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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $560,784,160 | 806,018,525 | 806,018,525 |
| 2006 | $464,395,646 | 567,128,162 | 567,128,162 |
| 2007 | $379,466,532 | 444,632,900 | 444,632,900 |
| 2008 | $247,208,776 | 273,580,279 | 273,580,279 |
| 2009 | $512,980,081 | 790,931,118 | 790,931,118 |
| 2010 | $703,807,799 | 829,329,104 | 829,329,104 |
| 2011 | $705,043,578 | 655,100,790 | 655,100,790 |
Note: Quantity represents Weight in kilograms
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