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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $189 | 200 | 522 |
| 2006 | $26,345 | 13,623 | 16,210 |
| 2007 | $30,680 | 17,758 | 18,410 |
| 2008 | $18,931 | 2,036 | 7,630 |
| 2009 | $55,582 | 36,195 | 32,695 |
| 2010 | $23,587 | 8,860 | 10,440 |
| 2011 | $12,887 | 5,285 | 3,940 |
Note: Quantity represents Number of pairs
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