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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $580,273,920 | 16,806 | 16,806 |
| 2006 | $652,160,479 | 16,957 | 16,957 |
| 2007 | $563,935,893 | 16,253 | 16,253 |
| 2008 | $902,513,066 | 23,228 | 23,228 |
| 2009 | $2,001,556,407 | 42,664 | 42,664 |
| 2010 | $1,776,969,221 | 33,348 | 33,348 |
Note: Quantity represents Weight in kilograms
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