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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,187,371,680 | 495,010,356 | 495,010,356 |
| 2006 | $2,666,753,230 | 314,173,451 | 314,173,451 |
| 2007 | $3,791,158,780 | 520,238,192 | 520,238,192 |
| 2008 | $3,756,608,326 | 416,681,423 | 416,681,423 |
| 2009 | $2,856,442,220 | 309,308,922 | 309,308,922 |
| 2010 | $3,246,290,917 | 332,065,834 | 332,065,834 |
| 2011 | $4,074,083,373 | 479,821,411 | 479,821,411 |
Note: Quantity represents Weight in kilograms
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