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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $62,333 | 8,917 | 2,705 |
| 2006 | $104,557 | 3,464 | 4,537 |
| 2007 | $248,265 | 8,276 | 8,583 |
| 2008 | $257,681 | 5,784 | 8,557 |
| 2009 | $243,147 | 7,257 | 6,613 |
| 2010 | $311,352 | 5,339 | 8,324 |
| 2011 | $679,745 | 11,972 | 18,330 |
Note: Quantity represents Number of pairs
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