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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $69,461,922 | $65,582,195 | $56,641,425 | $40,697,437 | $25,946,999 | $17,924,828 | $14,886,291 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $184,750 | $1,301,391 | $306,729 | $361,847 | $254,605 | $317,342 | $1,705,515 |
| Total | $69,646,672 | $66,883,586 | $56,948,154 | $41,059,284 | $26,201,604 | $18,242,170 | $16,591,806 |
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