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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $871,834,583 | 4,308,957 | 4,308,957 |
| 2006 | $949,790,759 | 4,760,823 | 4,760,823 |
| 2007 | $1,089,491,488 | 5,127,176 | 5,127,176 |
| 2008 | $1,193,584,242 | 5,204,982 | 5,204,982 |
| 2009 | $1,235,902,323 | 4,939,188 | 4,939,188 |
| 2010 | $1,590,536,254 | 6,694,400 | 6,694,400 |
| 2011 | $1,921,355,608 | 7,704,679 | 7,704,679 |
Note: Quantity represents Weight in kilograms
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