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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $977,088,215 | 1,215,568,555 | 1,215,568,555 |
| 2006 | $940,595,654 | 1,305,263,276 | 1,305,263,276 |
| 2007 | $1,187,187,573 | 1,343,393,643 | 1,343,393,643 |
| 2008 | $1,167,884,471 | 1,047,112,572 | 1,047,112,572 |
| 2009 | $680,964,367 | 1,245,883,154 | 1,245,883,154 |
| 2010 | $1,085,517,710 | 1,390,794,229 | 1,390,794,229 |
| 2011 | $1,450,002,970 | 1,364,955,048 | 1,364,955,048 |
Note: Quantity represents Weight in kilograms
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