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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $22,058,471 | $20,359,963 | $19,355,351 | $18,577,763 | $15,825,483 | $18,604,388 | $27,626,755 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $22,839,875 | $27,517,841 | $26,491,109 | $33,963,947 | $26,364,239 | $25,878,603 | $28,034,443 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $498,953 | $2,686,872 | $1,932,515 | $6,296,223 | $2,377,570 | $3,091,011 | $3,130,708 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $44,875,949 | $53,513,957 | $50,691,474 | $74,926,972 | $57,237,950 | $64,499,011 | $61,656,851 |
| Total | $90,273,248 | $104,078,633 | $98,470,449 | $133,764,905 | $101,805,242 | $112,073,013 | $120,448,757 |
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