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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $22,091 | 4,232 | 7,817 |
| 2006 | $34,921 | 5,172 | 11,407 |
| 2007 | $131,730 | 16 | 17,470 |
| 2008 | $87,853 | 8,235 | 11,582 |
| 2009 | $80,070 | 5,222 | 7,712 |
| 2010 | $179,617 | 25,960 | 42,414 |
| 2011 | $142,689 | 18,236 | 27,045 |
Note: Quantity represents Number of pairs
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