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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $148,699 | 27,948 | 9,690 |
| 2006 | $152,392 | 38,442 | 16,161 |
| 2007 | $154,501 | 24,447 | 11,335 |
| 2008 | $205,208 | 36,026 | 11,680 |
| 2009 | $139,237 | 27,376 | 8,886 |
| 2010 | $192,925 | 38,255 | 14,697 |
| 2011 | $207,216 | 39,860 | 15,140 |
Note: Quantity represents Number of pairs
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