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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,271 | 1,293 | 560 |
| 2006 | $32,758 | 51,918 | 59,802 |
| 2007 | $8,160 | 7,080 | 8,878 |
| 2008 | $16,927 | 26,069 | 115,162 |
| 2009 | $15,492 | 903 | 989 |
| 2010 | $11,838 | 11,558 | 11,102 |
| 2011 | $175,501 | 269,028 | 460,602 |
Note: Quantity represents Number of pairs
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