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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $19,723 | 6,020 | 7,597 |
| 2006 | $18,344 | 4,170 | 21,938 |
| 2007 | $126,662 | 30,813 | 87,683 |
| 2008 | $147,529 | 10,742 | 42,479 |
| 2009 | $44,977 | 6,217 | 34,939 |
| 2010 | $170,272 | 44,273 | 202,800 |
| 2011 | $80,501 | 10,669 | 51,051 |
Note: Quantity represents Number of pairs
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