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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $9,198 | 17,011 | 13,249 |
| 2006 | $8,356 | 1,969 | 4,898 |
| 2007 | $70,666 | 23,224 | 6,089 |
| 2008 | $27,588 | 22,654 | 8,181 |
| 2009 | $26,977 | 10,146 | 4,169 |
| 2010 | $4,551 | 1,184 | 1,959 |
| 2011 | $1,346 | 572 | 1,042 |
Note: Quantity represents Number of pairs
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