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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $40,957,478 | 1,746,503 | 1,538,693 |
| 2006 | $44,563,415 | 1,900,267 | 1,500,156 |
| 2007 | $58,827,698 | 2,006,577 | 2,286,046 |
| 2008 | $72,441,029 | 2,537,548 | 2,258,601 |
| 2009 | $56,011,137 | 1,801,223 | 2,030,386 |
| 2010 | $49,178,072 | 1,510,998 | 1,428,782 |
Note: Quantity represents Number of pairs
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