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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,093 | 79 | 107 |
| 2006 | $5,680 | 675 | 1,698 |
| 2007 | $21,342 | 7,170 | 15,196 |
| 2008 | $59,247 | 20,339 | 49,797 |
| 2009 | $50,200 | 16,112 | 71,454 |
| 2010 | $63,425 | 12,470 | 9,306 |
| 2011 | $11,660 | 4,874 | 5,136 |
Note: Quantity represents Number of pairs
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