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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $38,013 | 4,345 | 8,420 |
| 2006 | $47,966 | 10,283 | 10,625 |
| 2007 | $93,014 | 19,226 | 17,686 |
| 2008 | $123,520 | 29,126 | 15,153 |
| 2009 | $196,514 | 59,566 | 18,308 |
| 2010 | $169,067 | 35,065 | 15,988 |
| 2011 | $165,387 | 30,560 | 20,929 |
Note: Quantity represents Number of pairs
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