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| Year | Trade Value | Weight (kg) | Quantity |
| 2006 | $847,607 | 183,879 | 500,403 |
| 2007 | $1,075,731 | 149,506 | 438,622 |
| 2008 | $856,379 | 114,456 | 333,084 |
| 2009 | $535,731 | 79,131 | 214,957 |
| 2010 | $388,669 | 78,788 | 280,048 |
| 2011 | $587,815 | 37,536 | 107,022 |
Note: Quantity represents Number of pairs
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