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| Year | Trade Value | Weight (kg) | Quantity |
| 2008 | $849,728,253 | 2,793,616,437 | 2,793,616,437 |
| 2009 | $775,401,349 | 1,362,405,008 | 1,362,405,008 |
| 2010 | $968,841,221 | 2,697,925,976 | 2,697,925,976 |
| 2011 | $1,116,042,059 | 2,618,051,992 | 2,618,051,992 |
Note: Quantity represents Weight in kilograms
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