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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $29,941 | 5,005 | 12,043 |
| 2006 | $31,051 | 2,479 | 5,189 |
| 2007 | $52,039 | 4,164 | 12,440 |
| 2008 | $30,008 | 1,299 | 35,930 |
| 2009 | $30,406 | 1,186 | 0 |
| 2010 | $107,292 | 9,000 | 15,327 |
| 2011 | $470,575 | 83,936 | 398,510 |
Note: Quantity represents Number of pairs
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