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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $10,209 | 1,929 | 4,150 |
| 2006 | $45,745 | 3,129 | 12,868 |
| 2007 | $144,143 | 17,930 | 20,316 |
| 2008 | $101,861 | 6,724 | 20,150 |
| 2009 | $86,924 | 8,381 | 19,849 |
| 2010 | $95,029 | 10,702 | 24,846 |
| 2011 | $77,551 | 8,258 | 17,742 |
Note: Quantity represents Number of pairs
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