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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $101,526 | 2,060 | 6,760 |
| 2006 | $272,436 | 23,556 | 35,721 |
| 2007 | $227,724 | 2,786 | 7,034 |
| 2008 | $257,717 | 3,535 | 8,084 |
| 2009 | $177,619 | 4,999 | 9,146 |
| 2010 | $342,462 | 8,775 | 26,038 |
| 2011 | $208,893 | 9,384 | 28,866 |
Note: Quantity represents Number of pairs
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