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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,203,000 | 75,247 | 45,590 |
| 2006 | $1,572,000 | 98,328 | 59,574 |
| 2007 | $2,133,000 | 150,832 | 90,776 |
| 2008 | $4,273,000 | 285,022 | 178,303 |
| 2009 | $4,332,000 | 264,463 | 278,354 |
| 2010 | $6,199,000 | 432,307 | 463,678 |
| 2011 | $6,260,000 | 435,977 | 435,104 |
Note: Quantity represents Number of pairs
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