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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $41,499 | 6,019 | 6,008 |
| 2006 | $80,308 | 11,156 | 12,803 |
| 2007 | $152,948 | 23,865 | 36,529 |
| 2008 | $82,413 | 4,890 | 8,610 |
| 2009 | $53,437 | 4,687 | 5,847 |
| 2010 | $35,891 | 3,801 | 3,428 |
| 2011 | $61,063 | 3,354 | 3,977 |
Note: Quantity represents Number of pairs
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