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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $22,047,600 | $29,535,258 | $27,672,768 | $29,738,064 | $30,020,565 | $36,893,206 | $11,309,809 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $25,214,387 | $3,980,442 | $2,809,171 | $13,077,979 | $8,157,024 | $9,686,774 | $11,090,327 |
| Total | $47,261,987 | $33,515,700 | $30,481,939 | $42,816,043 | $38,177,589 | $46,579,980 | $22,400,136 |
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