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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $493,584 | 403,489 | 896,678 |
| 2006 | $958,521 | 1,011,870 | 2,090,506 |
| 2007 | $1,351,367 | 967,585 | 2,309,471 |
| 2008 | $1,648,529 | 885,482 | 2,059,492 |
| 2009 | $1,169,771 | 426,146 | 861,378 |
| 2011 | $1,804,397 | 798,113 | 1,652,190 |
Note: Quantity represents Number of pairs
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