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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,236,340,721 | 1,723,046,016 | 1,723,046,016 |
| 2006 | $1,483,138,773 | 2,113,742,992 | 2,113,742,992 |
| 2007 | $1,450,980,214 | 1,906,192,000 | 1,906,192,000 |
| 2008 | $1,269,172,783 | 1,316,104,598 | 1,316,104,598 |
| 2009 | $824,384,978 | 1,002,338,000 | 1,002,338,000 |
| 2010 | $1,045,434,675 | 1,441,056,992 | 1,441,056,992 |
| 2011 | $1,108,373,352 | 1,256,779,000 | 1,256,779,000 |
Note: Quantity represents Weight in kilograms
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