2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $50,000,000 $100,000,000 $150,000,000 $200,000,000 $250,000,000 $300,000,000 $350,000,000 $400,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $186,585,608 | 724,976,873 | 724,976,873 |
| 2006 | $274,578,421 | 781,527,009 | 781,527,009 |
| 2007 | $303,622,049 | 763,549,376 | 763,549,376 |
| 2008 | $326,776,743 | 711,671,749 | 711,671,749 |
| 2009 | $128,720,939 | 553,242,726 | 553,242,726 |
| 2010 | $159,206,178 | 546,586,712 | 546,586,712 |
| 2011 | $179,810,685 | 489,887,970 | 489,887,970 |
Note: Quantity represents Weight in kilograms
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