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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $5,500 | 484 | 1,230 |
| 2006 | $20,600 | 1,262 | 4,348 |
| 2007 | $90,600 | 12,251 | 45,845 |
| 2008 | $109,900 | 18,830 | 44,312 |
| 2009 | $49,400 | 4,605 | 15,873 |
| 2010 | $46,400 | 4,202 | 14,980 |
| 2011 | $49,500 | 1,846 | 6,879 |
Note: Quantity represents Number of pairs
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