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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,132,786,708 | 19,457,491,616 | 19,457,491,616 |
| 2006 | $1,321,437,123 | 21,690,520,976 | 21,690,520,976 |
| 2007 | $1,211,941,254 | 20,208,697,920 | 20,208,697,920 |
| 2008 | $1,531,058,428 | 18,923,024,912 | 18,923,024,912 |
| 2009 | $1,161,825,015 | 14,000,411,896 | 14,000,411,896 |
| 2010 | $1,316,254,371 | 14,010,040,848 | 14,010,040,848 |
| 2011 | $1,184,290,664 | 9,241,492,992 | 9,241,492,992 |
Note: Quantity represents Weight in kilograms
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