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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $766,160,000 | 4,971,036,800 | 4,971,036,800 |
| 2006 | $1,041,275,000 | 6,316,625,800 | 6,316,625,800 |
| 2007 | $1,164,796,000 | 4,645,456,100 | 4,645,456,100 |
| 2008 | $2,514,678,000 | 7,035,053,000 | 7,035,053,000 |
| 2009 | $2,194,766,000 | 9,674,581,100 | 9,674,581,100 |
| 2010 | $1,961,316,101 | 8,905,705,200 | 8,905,705,200 |
| 2011 | $1,972,465,754 | 6,142,026,991 | 6,142,026,991 |
Note: Quantity represents Weight in kilograms
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