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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $68,510 | 18,006 | 3,633 |
| 2006 | $133,196 | 32,636 | 7,064 |
| 2007 | $219,120 | 59,392 | 7,465 |
| 2008 | $142,088 | 28,462 | 5,372 |
| 2009 | $45,231 | 8,344 | 1,528 |
| 2010 | $221,607 | 42,245 | 7,952 |
| 2011 | $311,186 | 54,363 | 12,012 |
Note: Quantity represents Number of pairs
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