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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $56,346 | 4,288 | 14,163 |
| 2006 | $40,271 | 226 | 2,427 |
| 2007 | $171,141 | 25,583 | 12,267 |
| 2008 | $145,757 | 24,966 | 5,071 |
| 2009 | $70,106 | 3,885 | 7,750 |
| 2010 | $69,776 | 8,949 | 8,587 |
| 2011 | $69,140 | 6,380 | 9,071 |
Note: Quantity represents Number of pairs
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