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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $84,797 | 3,080 | 6,802 |
| 2006 | $44,535 | 1,618 | 3,572 |
| 2007 | $50,073 | 1,709 | 2,700 |
| 2008 | $15,891 | 399 | 6,923 |
| 2009 | $38,098 | 806 | 47,106 |
| 2010 | $24,274 | 11,446 | 1,862 |
| 2011 | $60,745 | 19,012 | 2,033 |
Note: Quantity represents Number of pairs
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