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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,834 | 31 | 31 |
| 2006 | $22,274 | 27 | 27 |
| 2007 | $18,306 | 92 | 92 |
| 2009 | $45,034 | 50 | 50 |
| 2010 | $993,003,690 | 2,594,140,015 | 2,594,140,015 |
| 2011 | $4,651,657,935 | 10,366,492,861 | 10,366,492,861 |
Note: Quantity represents Weight in kilograms
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