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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $60,943 | 6,676 | 4,128 |
| 2006 | $59,658 | 27,709 | 4,041 |
| 2007 | $20,303 | 3,650 | 950 |
| 2008 | $108,479 | 53,105 | 5,442 |
| 2009 | $110,824 | 50,336 | 4,581 |
| 2010 | $90,902 | 18,078 | 3,447 |
| 2011 | $345,933 | 43,110 | 16,877 |
Note: Quantity represents Number of pairs
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