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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $12,429 | 1,864 | 3,052,000 |
| 2006 | $7,824 | 645 | 634 |
| 2007 | $9,353 | 1,113 | 1,011 |
| 2008 | $77,135 | 18,582 | 25,029 |
| 2009 | $36,707 | 2,203 | 2,276 |
| 2010 | $79,836 | 4,473 | 2,437 |
| 2011 | $248,421 | 20,018 | 13,687 |
Note: Quantity represents Number of pairs
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