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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,537,563,752 | 40,695,516 | 40,695,516 |
| 2006 | $3,235,053,508 | 35,278,974 | 35,278,974 |
| 2007 | $1,928,052,526 | 50,366,723 | 50,366,723 |
| 2008 | $1,842,567,150 | 59,145,555 | 59,145,555 |
| 2009 | $2,203,787,965 | 355,341,116 | 355,341,116 |
| 2010 | $1,841,076,207 | 70,739,024 | 70,739,024 |
| 2011 | $1,270,109,727 | 18,684,744 | 18,684,744 |
Note: Quantity represents Weight in kilograms
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