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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,094,666 | 324,937 | 569,096 |
| 2006 | $9,558,202 | 403,600 | 407,760 |
| 2007 | $11,803,090 | 441,185 | 436,707 |
| 2008 | $8,323,373 | 223,140 | 233,788 |
| 2009 | $6,138,912 | 201,343 | 285,080 |
| 2010 | $3,067,744 | 75,984 | 102,476 |
| 2011 | $3,175,769 | 67,502 | 98,523 |
Note: Quantity represents Number of pairs
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