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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $241,430,713 | 15,232,015 | 26,582,808 |
| 2006 | $318,955,984 | 20,123,133 | 35,089,107 |
| 2007 | $444,654,831 | 30,298,209 | 46,935,974 |
| 2008 | $561,558,537 | 33,959,709 | 52,487,167 |
| 2009 | $428,210,697 | 57,916,122 | 18,494,626 |
| 2010 | $611,162,335 | 83,146,138 | 57,108,338 |
| 2011 | $771,223,115 | 93,647,615 | 64,913,327 |
Note: Quantity represents Number of pairs
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