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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $16,224,000 | 612,651 | 629,177 |
| 2006 | $14,691,000 | 554,762 | 569,726 |
| 2007 | $9,473,000 | 324,641 | 420,846 |
| 2008 | $10,226,000 | 358,022 | 286,318 |
| 2009 | $4,752,000 | 148,909 | 131,016 |
| 2010 | $8,539,000 | 262,321 | 262,376 |
| 2011 | $13,783,000 | 411,088 | 424,129 |
Note: Quantity represents Number of pairs
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