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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $795,971,636 | 5,400,064,500 | 5,400,064,500 |
| 2006 | $656,425,100 | 4,276,437,300 | 4,276,437,300 |
| 2007 | $1,187,322,629 | 5,112,190,900 | 5,112,190,900 |
| 2008 | $1,505,568,540 | 5,030,758,600 | 5,030,758,600 |
| 2009 | $1,047,821,991 | 4,743,336,000 | 4,743,336,000 |
| 2010 | $1,030,371,611 | 5,708,798,900 | 5,708,798,900 |
| 2011 | $1,378,696,984 | 5,002,634,400 | 5,002,634,400 |
Note: Quantity represents Weight in kilograms
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