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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $46,778 | $23,985 | $36,135 | $107,601 | $26,722 | $42,796 | $147,841 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $71,364 | $50,089 | $5,009 | $165,909 | $21,103 | $204,839 | $5,158 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $78,419 | | $222,304 | $14,201 | | $424 | $19,432 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $142,420 | $149,619 | $249,993 | $176,230 | $74,706 | $155,690 | $79,690 |
| Total | $338,981 | $223,693 | $513,441 | $463,941 | $122,531 | $403,749 | $252,121 |
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