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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,248 | 307 | 251 |
| 2006 | $148,157 | 17,861 | 11,471 |
| 2007 | $37,320 | 3,672 | 2,603 |
| 2008 | $33,322 | 2,323 | 1,904 |
| 2009 | $174,694 | 19,927 | 0 |
| 2010 | $551,354 | 80,506 | 28,748 |
| 2011 | $424,091 | 41,243 | 21,267 |
Note: Quantity represents Number of pairs
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