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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,720,781,257 | 4,059,999,044 | 4,059,999,044 |
| 2006 | $6,113,901,962 | 3,611,676,940 | 3,611,676,940 |
| 2007 | $8,832,772,026 | 4,524,695,708 | 4,524,695,708 |
| 2008 | $9,930,443,877 | 5,187,022,967 | 5,187,022,967 |
| 2009 | $8,478,683,710 | 6,132,346,265 | 6,132,346,265 |
| 2010 | $13,025,094,514 | 6,466,115,913 | 6,466,115,913 |
| 2011 | $15,338,994,191 | 6,383,259,859 | 6,383,259,859 |
Note: Quantity represents Weight in kilograms
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