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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $13,009 | 7,607 | 1,711 |
| 2006 | $19,304 | 5,128 | 1,691 |
| 2007 | $15,667 | 2,355 | 2,223 |
| 2008 | $14,164 | 4,532 | 1,042 |
| 2009 | $28,462 | 7,855 | 1,863 |
| 2010 | $43,280 | 5,998 | 2,832 |
| 2011 | $17,595 | 4,086 | 1,120 |
Note: Quantity represents Number of pairs
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