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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $40,812 | 4,464 | 1,583 |
| 2006 | $54,366 | 6,759 | 1,333 |
| 2007 | $67,933 | 43,481 | 3,179 |
| 2008 | $53,352 | 7,056 | 2,104 |
| 2009 | $37,158 | 5,745 | 5,400 |
| 2010 | $41,796 | 2,478 | 876 |
| 2011 | $28,463 | 4,868 | 1,141 |
Note: Quantity represents Number of pairs
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