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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $30,020,000 | 2,331,397,661 | 2,331,397,661 |
| 2006 | $28,756,000 | 2,268,019,571 | 2,268,019,571 |
| 2007 | $30,786,000 | 1,915,654,350 | 1,915,654,350 |
| 2008 | $30,006,000 | 1,958,810,281 | 1,958,810,281 |
| 2009 | $32,455,000 | 2,150,157,100 | 2,150,157,100 |
| 2010 | $28,798,494 | 1,978,836,700 | 1,978,836,700 |
| 2011 | $32,452,332 | 1,809,959,393 | 1,809,959,393 |
Note: Quantity represents Weight in kilograms
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