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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $5,630,240,444 | 179,150,719 | 179,150,719 |
| 2006 | $8,765,945,335 | 266,226,514 | 266,226,514 |
| 2007 | $8,168,520,037 | 285,900,598 | 285,900,598 |
| 2008 | $9,070,891,896 | 318,228,540 | 318,228,540 |
| 2009 | $9,815,614,837 | 377,089,722 | 377,089,722 |
| 2010 | $11,283,507,308 | 0 | 0 |
| 2011 | $9,572,043,572 | 0 | 0 |
Note: Quantity represents Weight in kilograms
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