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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $37,620 | 1,913 | 1,431 |
| 2006 | $22,125 | 2,214 | 995 |
| 2007 | $13,128 | 1,889 | 293 |
| 2008 | $42,455 | 2,996 | 1,316 |
| 2009 | $27,187 | 3,208 | 1,429 |
| 2010 | $45,319 | 1,984 | 1,068 |
| 2011 | $86,807 | 4,185 | 1,793 |
Note: Quantity represents Number of pairs
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