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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $175,295 | 17,653 | 2,191 |
| 2006 | $185,789 | 16,199 | 2,322 |
| 2007 | $262,453 | 10,682 | 2,507 |
| 2008 | $73,292 | 1,524 | 601 |
| 2009 | $127,751 | 3,564 | 1,019 |
| 2010 | $215,523 | 38,437 | 1,756 |
| 2011 | $70,202 | 1,871 | 583 |
Note: Quantity represents Number of pairs
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