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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $249,000 | 8,618 | 3,112 |
| 2006 | $142,000 | 4,914 | 1,775 |
| 2007 | $199,000 | 6,105 | 1,901 |
| 2008 | $110,000 | 3,055 | 902 |
| 2009 | $151,000 | 3,953 | 1,205 |
| 2010 | $134,000 | 3,568 | 1,438 |
| 2011 | $112,000 | 2,984 | 822 |
Note: Quantity represents Number of pairs
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