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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $83,702 | 99,566 | 253,091 |
| 2006 | $138,091 | 129,246 | 458,053 |
| 2007 | $90,954 | 74,772 | 60,763 |
| 2008 | $281,785 | 66,139 | 144,888 |
| 2009 | $101,803 | 106,572 | 19,718 |
| 2010 | $154,390 | 89,234 | 110,835 |
| 2011 | $39,108 | 25,782 | 16,423 |
Note: Quantity represents Number of pairs
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