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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $34,326 | 3,490 | 2,200 |
| 2006 | $22,542 | 2,577 | 1,195 |
| 2007 | $71,905 | 7,480 | 2,450 |
| 2008 | $32,636 | 5,263 | 1,234 |
| 2009 | $27,932 | 3,718 | 944 |
| 2010 | $27,050 | 2,740 | 971 |
| 2011 | $29,130 | 4,889 | 1,124 |
Note: Quantity represents Number of pairs
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