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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $941,567 | 131,474 | 49,932 |
| 2006 | $1,376,853 | 218,463 | 73,016 |
| 2007 | $1,631,830 | 194,188 | 55,595 |
| 2008 | $1,769,360 | 204,447 | 66,894 |
| 2009 | $1,116,620 | 170,693 | 37,718 |
| 2010 | $779,088 | 140,369 | 27,957 |
| 2011 | $1,148,218 | 179,868 | 44,320 |
Note: Quantity represents Number of pairs
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