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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $4,634,446 | $2,145,199 | $3,749,363 | $2,798,467 | $1,924,640 | $5,178,171 | $3,443,398 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $9,887,590 | $13,030,731 | $10,816,930 | $11,345,211 | $7,765,369 | $8,298,293 | $8,778,280 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $397 | $12,771 | $537,193 | $317,013 | $2,395,075 | $1,965,268 | $632,078 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $16,527,001 | $32,599,815 | $16,968,137 | $17,988,844 | $14,928,041 | $10,910,387 | $14,598,233 |
| Total | $31,049,434 | $47,788,516 | $32,071,623 | $32,449,535 | $27,013,125 | $26,352,119 | $27,451,989 |
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