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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $356,944,487 | 1,200,078,600 | 1,200,078,600 |
| 2006 | $345,070,518 | 1,198,509,100 | 1,198,509,100 |
| 2007 | $406,091,316 | 1,047,848,100 | 1,047,848,100 |
| 2008 | $549,716,818 | 1,005,508,500 | 1,005,508,500 |
| 2009 | $533,984,297 | 949,481,196 | 949,481,196 |
| 2010 | $487,865,999 | 1,134,558,165 | 1,134,558,165 |
| 2011 | $562,578,347 | 1,240,193,101 | 1,240,193,101 |
Note: Quantity represents Weight in kilograms
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