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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $37,445 | 4,028 | 3,281 |
| 2006 | $47,941 | 10,257 | 4,201 |
| 2007 | $8,675 | 411 | 1,231 |
| 2008 | $60,287 | 28,183 | 4,437 |
| 2009 | $107,782 | 21,291 | 7,055 |
| 2010 | $87,377 | 45,363 | 5,717 |
| 2011 | $143,679 | 171,453 | 9,146 |
Note: Quantity represents Number of pairs
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