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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $22,944 | 978 | 10,680 |
| 2006 | $16,964 | 723 | 3,620 |
| 2007 | $39,095 | 1,334 | 7,431 |
| 2008 | $20,301 | 711 | 2,384 |
| 2009 | $15,224 | 490 | 2,047 |
| 2010 | $254,759 | 7,827 | 27,498 |
| 2011 | $312,417 | 9,204 | 34,123 |
Note: Quantity represents Number of pairs
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