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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $2,985,845 | $3,570,650 | $3,795,546 | $5,271,089 | $3,727,301 | $5,967,685 | $4,911,601 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $17,427,291 | $21,398,786 | $25,689,058 | $24,245,236 | $15,803,478 | $19,616,663 | $19,071,002 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $723,485 | $864,254 | $6,514,688 | $1,505,913 | $375,211 | $315,076 | $473,893 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $28,055,748 | $40,516,862 | $50,511,480 | $43,039,969 | $41,147,996 | $50,481,469 | $73,648,083 |
| Total | $49,192,369 | $66,350,552 | $86,510,772 | $74,062,207 | $61,053,986 | $76,380,893 | $98,104,579 |
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