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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,819,499,160 | 4,320,036,072 | 4,320,036,072 |
| 2006 | $9,171,678,891 | 4,633,386,960 | 4,633,386,960 |
| 2007 | $10,860,837,540 | 5,051,217,216 | 5,051,217,216 |
| 2008 | $10,036,901,520 | 4,941,292,056 | 4,941,292,056 |
| 2009 | $8,229,623,457 | 4,775,694,946 | 4,775,694,946 |
| 2010 | $11,704,531,274 | 5,354,992,024 | 5,354,992,024 |
| 2011 | $11,805,294,488 | 4,389,052,000 | 4,389,052,000 |
Note: Quantity represents Weight in kilograms
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