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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,209,312,716 | 26,228,655,040 | 26,228,655,040 |
| 2006 | $4,007,246,870 | 22,198,795,715 | 22,198,795,715 |
| 2007 | $7,742,648,855 | 30,679,345,511 | 30,679,345,511 |
| 2008 | $11,045,744,836 | 47,679,474,112 | 47,679,474,112 |
| 2009 | $5,133,998,557 | 21,053,853,572 | 21,053,853,572 |
| 2010 | $6,488,937,586 | 26,579,107,833 | 26,579,107,833 |
| 2011 | $10,871,430,358 | 32,035,556,492 | 32,035,556,492 |
Note: Quantity represents Weight in kilograms
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