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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $177,699,579 | 4,291,892,812 | 4,291,892,812 |
| 2006 | $114,612,023 | 1,986,337,202 | 1,986,337,202 |
| 2007 | $53,030,682 | 920,815,563 | 920,815,563 |
| 2008 | $400,479,229 | 4,747,444,891 | 4,747,444,891 |
| 2009 | $214,073,718 | 2,292,223,876 | 2,292,223,876 |
| 2010 | $1,784,622,405 | 4,768,603,989 | 4,768,603,989 |
| 2011 | $1,349,560,266 | 5,089,806,855 | 5,089,806,855 |
Note: Quantity represents Weight in kilograms
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