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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $226,161,483 | 9,020,867 | 14,447,203 |
| 2006 | $269,525,371 | 10,098,214 | 16,291,263 |
| 2007 | $293,663,477 | 9,507,485 | 14,983,904 |
| 2008 | $329,259,695 | 8,081,398 | 15,015,030 |
| 2009 | $286,996,555 | 8,608,086 | 15,228,695 |
| 2010 | $367,383,697 | 8,949,431 | 18,654,976 |
| 2011 | $460,740,372 | 10,441,209 | 19,926,718 |
Note: Quantity represents Number of pairs
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