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| Year | Trade Value | Weight (kg) | Quantity |
| 2006 | $54,915,839,438 | 3,810,095,246 | 3,810,095,246 |
| 2007 | $50,149,245,693 | 0 | 0 |
| 2008 | $74,832,133,207 | 0 | 0 |
| 2009 | $42,212,038,172 | 165,649,257 | 165,649,257 |
| 2010 | $60,904,645,725 | 786,814,837 | 786,814,837 |
Note: Quantity represents Weight in kilograms
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