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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $5,199 | 13,808 | 5,853 |
| 2006 | $7,947 | 33,630 | 11,647 |
| 2007 | $21,585 | 40,450 | 18,102 |
| 2008 | $23,917 | 63,693 | 904 |
| 2009 | $13,548 | 47,563 | 458 |
| 2010 | $12,309 | 48,701 | 19,656 |
| 2011 | $35,315 | 53,535 | 30,035 |
Note: Quantity represents Number of pairs
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