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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $76,736,596 | $69,636,686 | $87,238,837 | $80,222,570 | $72,571,727 | $57,011,166 | $51,589,682 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $9,745,141 | $5,746,652 | $3,351,766 | $8,549,074 | $22,697,432 | $1,569,970 | $3,467,010 |
| Total | $86,481,737 | $75,383,338 | $90,590,603 | $88,771,644 | $95,269,159 | $58,581,136 | $55,056,692 |
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