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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $9,800 | 8,828 | 1,289 |
| 2006 | $25,934 | 9,224 | 6,906 |
| 2007 | $32,022 | 744 | 1,011 |
| 2008 | $101,012 | 2,722 | 3,566 |
| 2009 | $210,731 | 15,644 | 15,470 |
| 2010 | $91,925 | 5,523 | 9,141 |
| 2011 | $594,095 | 62,411 | 70,998 |
Note: Quantity represents Number of pairs
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