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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $458,865,553 | 30,406 | 30,406 |
| 2006 | $658,533,459 | 32,853 | 32,853 |
| 2007 | $790,820,940 | 35,851 | 35,851 |
| 2008 | $1,032,445,604 | 37,020 | 37,020 |
| 2009 | $1,400,496,706 | 45,610 | 45,610 |
| 2010 | $1,786,097,580 | 45,931 | 45,931 |
| 2011 | $2,239,357,323 | 44,679 | 44,679 |
Note: Quantity represents Weight in kilograms
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