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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $17 | 4 | 2 |
| 2006 | $34,806 | 47,429 | 4,985 |
| 2007 | $469,524 | 182,134 | 71,055 |
| 2008 | $891,546 | 309,961 | 93,338 |
| 2009 | $1,424,624 | 446,127 | 132,130 |
| 2010 | $1,235,135 | 394,399 | 96,104 |
| 2011 | $223,401 | 70,130 | 40,415 |
Note: Quantity represents Number of pairs
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