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| Year | Trade Value | Weight (kg) | Quantity |
| 2007 | $3,675,459,893 | 7,162,494,608 | 7,162,494,608 |
| 2008 | $4,904,180,728 | 7,261,664,683 | 7,261,664,683 |
| 2009 | $2,719,270,634 | 6,166,033,720 | 6,166,033,720 |
| 2010 | $3,080,833,617 | 5,355,540,476 | 5,355,540,476 |
| 2011 | $4,022,466,864 | 4,999,510,876 | 4,999,510,876 |
Note: Quantity represents Weight in kilograms
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