2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $20,000,000 $40,000,000 $60,000,000 $80,000,000 $100,000,000 $120,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $24,951,350 | 1,816,487 | 2,001,463 |
| 2006 | $47,741,139 | 1,941,307 | 3,829,538 |
| 2007 | $65,443,043 | 2,416,718 | 3,528,382 |
| 2008 | $70,521,269 | 2,497,764 | 2,600,105 |
| 2009 | $71,421,019 | 2,632,117 | 2,354,439 |
| 2010 | $87,581,378 | 3,288,282 | 2,730,497 |
| 2011 | $94,230,288 | 3,259,599 | 3,153,230 |
Note: Quantity represents Number of pairs
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