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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $6,388,283,174 | 875,287,512 | 875,287,512 |
| 2006 | $7,205,501,548 | 801,398,924 | 801,398,924 |
| 2007 | $7,132,204,644 | 726,328,759 | 726,328,759 |
| 2008 | $7,339,585,414 | 666,759,750 | 666,759,750 |
| 2009 | $5,316,506,474 | 548,127,378 | 548,127,378 |
| 2010 | $5,925,301,532 | 590,609,539 | 590,609,539 |
| 2011 | $6,776,330,084 | 627,658,593 | 627,658,593 |
Note: Quantity represents Weight in kilograms
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