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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $984,604 | 159,096 | 76,233 |
| 2006 | $1,101,228 | 173,631 | 85,262 |
| 2007 | $534,815 | 70,319 | 37,307 |
| 2008 | $569,921 | 62,147 | 32,573 |
| 2009 | $316,069 | 30,675 | 0 |
| 2010 | $121,996 | 9,636 | 6,361 |
| 2011 | $141,320 | 21,462 | 7,087 |
Note: Quantity represents Number of pairs
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