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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $22,541 | 4,134 | 1,878 |
| 2006 | $139,777 | 2,415 | 4,438 |
| 2007 | $6,118 | 546 | 780 |
| 2008 | $490,657 | 36,010 | 28,100 |
| 2009 | $248,850 | 18,785 | 20,597 |
| 2010 | $951,056 | 941 | 84,903 |
| 2011 | $142,695 | 587 | 1,759 |
Note: Quantity represents Number of pairs
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