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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $22,314 | 6,034 | 4,943 |
| 2006 | $5,828 | 463 | 1,291 |
| 2007 | $6,225 | 8,569 | 1,184 |
| 2008 | $15,200 | 19,756 | 1,865 |
| 2009 | $35,959 | 72,542 | 3,350 |
| 2010 | $28,797 | 3,162 | 2,723 |
| 2011 | $10,623 | 5,117 | 1,344 |
Note: Quantity represents Number of pairs
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