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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $48,465 | 9,577 | 8,687 |
| 2006 | $15,450 | 2,793 | 2,769 |
| 2007 | $12,239 | 2,286 | 1,725 |
| 2008 | $15,830 | 6,108 | 1,520 |
| 2009 | $26,563 | 5,189 | 2,489 |
| 2010 | $13,140 | 2,946 | 1,149 |
| 2011 | $18,038 | 2,452 | 1,883 |
Note: Quantity represents Number of pairs
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