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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $60,948 | 5,734 | 2,749 |
| 2006 | $137,173 | 8,392 | 7,081 |
| 2007 | $61,325 | 8,331 | 4,320 |
| 2008 | $17,532 | 1,501 | 759 |
| 2009 | $14,392 | 1,172 | 999 |
| 2010 | $19,012 | 2,025 | 1,083 |
| 2011 | $41,535 | 41,910 | 68,488 |
Note: Quantity represents Number of pairs
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