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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $364,480,000 | 591,690,500 | 591,690,500 |
| 2006 | $370,084,000 | 562,723,700 | 562,723,700 |
| 2007 | $343,996,000 | 487,717,900 | 487,717,900 |
| 2008 | $442,638,000 | 524,492,200 | 524,492,200 |
| 2009 | $405,063,000 | 511,227,710 | 511,227,710 |
| 2010 | $396,285,663 | 504,656,600 | 504,656,600 |
| 2011 | $401,253,170 | 482,948,255 | 482,948,255 |
Note: Quantity represents Weight in kilograms
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