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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $289,174 | 33,282 | 171,016 |
| 2006 | $149,321 | 3,783 | 5,298 |
| 2007 | $581,823 | 23,322 | 26,259 |
| 2008 | $351,290 | 4,815 | 10,452 |
| 2009 | $397,191 | 2,108 | 3,217 |
| 2010 | $303,153 | 2,669 | 16,344 |
| 2011 | $520,020 | 4,337 | 7,945 |
Note: Quantity represents Number of pairs
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