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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $23,013 | 2,842 | 1,306 |
| 2006 | $33,415 | 4,531 | 1,897 |
| 2007 | $21,183 | 2,990 | 994 |
| 2008 | $18,818 | 3,573 | 798 |
| 2009 | $13,067 | 1,290 | 533 |
| 2010 | $187,700 | 29,206 | 7,738 |
| 2011 | $127,540 | 26,326 | 6,997 |
Note: Quantity represents Number of pairs
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