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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $24,725 | 1,058 | 2,485 |
| 2006 | $25,740 | 1,025 | 842 |
| 2007 | $130,807 | 4,133 | 5,732 |
| 2008 | $2,957,855 | 90,133 | 154,741 |
| 2009 | $350,419 | 8,657 | 13,410 |
| 2010 | $1,998,636 | 2,862 | 74,152 |
| 2011 | $552,928 | 15,516 | 108,658 |
Note: Quantity represents Number of pairs
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