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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,839 | 100 | 396 |
| 2006 | $15,629 | 849 | 1,674 |
| 2007 | $87,504 | 50,092 | 6,542 |
| 2008 | $67,300 | 44,933 | 0 |
| 2009 | $81,191 | 86,734 | 8,594 |
| 2010 | $72,330 | 138,215 | 49,117 |
| 2011 | $80,233 | 117,107 | 17,717 |
Note: Quantity represents Number of pairs
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