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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $9,545,666,300 | 177,491,107 | 177,491,107 |
| 2006 | $12,007,780,226 | 247,409,561 | 247,409,561 |
| 2007 | $9,048,860,198 | 229,718,673 | 229,718,673 |
| 2008 | $9,053,299,631 | 211,288,065 | 211,288,065 |
| 2009 | $7,662,320,886 | 160,548,819 | 160,548,819 |
| 2010 | $9,257,310,909 | 157,643,084 | 157,643,084 |
| 2011 | $9,679,889,993 | 170,106,602 | 170,106,602 |
Note: Quantity represents Weight in kilograms
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