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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $15,341 | 5,836 | 2,556 |
| 2006 | $12,332 | 4,729 | 2,055 |
| 2007 | $9,505 | 3,591 | 1,211 |
| 2008 | $23,999 | 24,765 | 0 |
| 2009 | $11,290 | 1,720 | 671 |
| 2010 | $23,096 | 33,405 | 1,339 |
| 2011 | $42,787 | 72,454 | 2,483 |
Note: Quantity represents Number of pairs
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