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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $12,226 | 956 | 5,109 |
| 2006 | $60,040 | 4,693 | 18,285 |
| 2007 | $67,558 | 18,459 | 43,401 |
| 2008 | $46,262 | 29,328 | 10,100 |
| 2009 | $54,091 | 21,072 | 41,684 |
| 2010 | $20,215 | 30,774 | 16,242 |
| 2011 | $66,616 | 35,946 | 21,942 |
Note: Quantity represents Number of pairs
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