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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $48,275 | 2,567 | 1,596 |
| 2006 | $159,001 | 8,404 | 9,456 |
| 2007 | $115,144 | 7,008 | 11,007 |
| 2008 | $203,826 | 10,089 | 12,271 |
| 2009 | $242,342 | 10,560 | 21,044 |
| 2010 | $539,580 | 16,533 | 21,872 |
| 2011 | $778,373 | 29,441 | 40,485 |
Note: Quantity represents Number of pairs
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