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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $16,334,873 | 1,021,735 | 759,423 |
| 2006 | $17,494,374 | 1,094,261 | 821,694 |
| 2007 | $17,683,522 | 1,250,463 | 752,572 |
| 2008 | $14,313,586 | 954,760 | 503,429 |
| 2009 | $10,122,255 | 617,950 | 371,241 |
| 2010 | $9,434,680 | 657,958 | 395,246 |
| 2011 | $9,396,014 | 654,384 | 419,403 |
Note: Quantity represents Number of pairs
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