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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $30,440,387 | $29,804,295 | $32,565,027 | $42,849,177 | $32,143,424 | $22,371,488 | $17,750,269 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $27,540,058 | $29,589,632 | $39,247,636 | $32,397,978 | $21,841,579 | $17,831,443 | $20,524,531 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $1,987,055 | $5,867,462 | $1,823,652 | $3,627,311 | $1,072,559 | $4,114,541 | $378,435 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $32,204,722 | $26,805,287 | $28,147,918 | $75,536,277 | $52,558,166 | $45,472,035 | $41,213,236 |
| Total | $92,172,222 | $92,066,676 | $101,784,233 | $154,410,743 | $107,615,728 | $89,789,507 | $79,866,471 |
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