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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $16,600 | 8,803 | 5,164 |
| 2006 | $21,000 | 5,688 | 3,444 |
| 2007 | $80,100 | 22,629 | 16,344 |
| 2008 | $4,100 | 481 | 519 |
| 2009 | $145,100 | 11,670 | 19,036 |
| 2010 | $192,900 | 26,985 | 33,703 |
| 2011 | $530,400 | 38,848 | 37,594 |
Note: Quantity represents Number of pairs
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