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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $6,679 | 1,292 | 7,641 |
| 2006 | $9,332 | 988 | 2,969 |
| 2007 | $48,009 | 22,247 | 131,659 |
| 2008 | $133,106 | 56,623 | 110,065 |
| 2009 | $402,949 | 121,295 | 346,510 |
| 2010 | $99,659 | 25,744 | 125,525 |
| 2011 | $835,211 | 219,947 | 687,329 |
Note: Quantity represents Number of pairs
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