2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000,000 $200,000,000 $300,000,000 $400,000,000 $500,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $256,015,644 | 38,446,938 | 38,446,938 |
| 2006 | $226,854,034 | 36,158,188 | 36,158,188 |
| 2007 | $244,071,843 | 30,562,916 | 30,562,916 |
| 2008 | $240,281,239 | 25,550,277 | 25,550,277 |
| 2009 | $198,932,802 | 26,294,210 | 26,294,210 |
| 2010 | $285,975,729 | 32,213,379 | 32,213,379 |
| 2011 | $405,837,146 | 31,654,510 | 31,654,510 |
Note: Quantity represents Weight in kilograms
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