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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,797,051,965 | 262,303,632 | 262,303,632 |
| 2006 | $1,623,600,190 | 280,659,095 | 280,659,095 |
| 2007 | $2,325,983,063 | 577,896,661 | 577,896,661 |
| 2008 | $2,296,063,455 | 440,210,421 | 440,210,421 |
| 2009 | $1,359,017,303 | 153,482,810 | 153,482,810 |
| 2010 | $2,055,628,189 | 246,561,920 | 246,561,920 |
| 2011 | $2,431,408,132 | 272,610,349 | 272,610,349 |
Note: Quantity represents Weight in kilograms
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