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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $33,199 | 17,662 | 3,155 |
| 2006 | $82 | 53 | 8 |
| 2007 | $1,874 | 4,000 | 182 |
| 2008 | $70,333 | 19,799 | 4,972 |
| 2009 | $340,604 | 443,262 | 20,375 |
| 2010 | $900,503 | 401,544 | 51,362 |
| 2011 | $393,630 | 911,707 | 12,474 |
Note: Quantity represents Number of pairs
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