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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $21,370 | 6,587 | 1,030 |
| 2006 | $22,590 | 8,153 | 8,284 |
| 2007 | $22,102 | 1,927 | 4,203 |
| 2008 | $18,359 | 2,864 | 974 |
| 2009 | $52,971 | 3,268 | 2,094 |
| 2010 | $68,620 | 2,916 | 1,174 |
| 2011 | $41,916 | 2,893 | 1,446 |
Note: Quantity represents Number of pairs
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