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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $3,534 | $32,114 | $122,112 | $809,446 | $523,174 | $695,937 | $534,017 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $4,744,041 | $4,532,454 | $6,970,681 | $5,497,292 | $2,383,980 | $1,869,999 | $2,047,217 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $30,255 | $76,440 | $599,169 | $230,087 | $858 | $84,894 | $34,175 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $16,423,626 | $14,224,242 | $13,277,266 | $15,013,962 | $15,417,079 | $18,962,813 | $25,248,504 |
| Total | $21,201,456 | $18,865,250 | $20,969,228 | $21,550,787 | $18,325,091 | $21,613,643 | $27,863,913 |
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