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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $8,498 | 462 | 431 |
| 2006 | $40,089 | 2,177 | 1,484 |
| 2007 | $223,663 | 14,383 | 28,508 |
| 2008 | $24,862 | 865 | 1,291 |
| 2009 | $114,877 | 3,966 | 3,587 |
| 2010 | $424,123 | 17,846 | 48,363 |
| 2011 | $1,170,117 | 44,845 | 106,270 |
Note: Quantity represents Number of pairs
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