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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,189,615,000 | 6,320,761,587 | 6,320,761,587 |
| 2007 | $2,978,209,000 | 6,064,640,573 | 6,064,640,573 |
| 2010 | $2,947,300,000 | 5,310,898,500 | 5,310,898,500 |
| 2011 | $4,628,758,000 | 5,919,262,200 | 5,919,262,200 |
Note: Quantity represents Weight in kilograms
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