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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $25,787 | 1,101 | 2,590 |
| 2006 | $119,425 | 5,100 | 11,994 |
| 2007 | $30,957 | 8,061 | 2,709 |
| 2008 | $100,082 | 3,052 | 12,007 |
| 2009 | $16,400 | 356 | 982 |
| 2010 | $77,076 | 3,851 | 3,810 |
| 2011 | $121,246 | 87,759 | 4,425 |
Note: Quantity represents Number of pairs
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