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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $17,405 | 768 | 3,269 |
| 2006 | $42,678 | 2,209 | 6,352 |
| 2007 | $31,513 | 1,646 | 6,375 |
| 2008 | $128,996 | 5,506 | 22,438 |
| 2009 | $28,621 | 988 | 4,532 |
| 2010 | $31,181 | 853 | 6,163 |
| 2011 | $61,070 | 1,568 | 10,125 |
Note: Quantity represents Number of pairs
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