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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $14,441,822 | $7,703,323 | $23,282,186 | $36,808,225 | $28,039,953 | $29,135,772 | $23,678,304 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $18,375,053 | $24,971,857 | $29,485,978 | $51,550,737 | $48,402,489 | $76,615,272 | $63,083,014 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $4,371,623 | $5,472,526 | $33,557,930 | $28,014,566 | $34,459,871 | $18,638,755 | $32,473,283 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $18,230,145 | $21,300,295 | $50,445,795 | $63,428,959 | $48,578,668 | $57,328,109 | $44,222,177 |
| Total | $55,418,643 | $59,448,001 | $136,771,889 | $179,802,487 | $159,480,981 | $181,717,908 | $163,456,778 |
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