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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $26,869 | 52,596 | 10,014 |
| 2006 | $18,849 | 43,101 | 53,880 |
| 2007 | $25,975 | 46,508 | 58,112 |
| 2008 | $27,559 | 42,920 | 29,888 |
| 2009 | $66,647 | 12,679 | 3,959 |
| 2010 | $7,618 | 216 | 442 |
| 2011 | $28,686 | 1,027 | 1,664 |
Note: Quantity represents Number of pairs
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