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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $116,484,191 | 3,685,420 | 9,356,412 |
| 2006 | $162,549,433 | 5,142,868 | 10,753,103 |
| 2007 | $216,762,776 | 6,764,625 | 12,989,281 |
| 2008 | $198,613,317 | 4,501,028 | 10,519,690 |
| 2009 | $184,844,285 | 3,592,933 | 9,865,650 |
| 2010 | $301,559,795 | 6,014,013 | 6,576,417 |
| 2011 | $390,879,600 | 8,657,120 | 17,942,789 |
Note: Quantity represents Number of pairs
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