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| Year | Trade Value | Weight (kg) | Quantity |
| 2007 | $8 | 12 | 12 |
| 2008 | $2,199 | 218 | 218 |
| 2009 | $415,049,042 | 837,145,170 | 837,145,170 |
| 2010 | $672,376,161 | 1,717,650,961 | 1,717,650,961 |
| 2011 | $637,829,818 | 1,116,818,490 | 1,116,818,490 |
Note: Quantity represents Weight in kilograms
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