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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $45,537,360 | $41,947,622 | $63,815,337 | $54,970,206 | $46,023,584 | $62,573,767 | $66,989,099 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $108,688,400 | $99,423,297 | $136,532,111 | $163,458,369 | $160,760,028 | $127,491,888 | $164,705,202 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $6,369,411 | $12,001,851 | $3,216,150 | $34,371,998 | $10,018,723 | $7,832,466 | $13,287,539 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $33,676,654 | $21,818,092 | $29,231,556 | $31,227,777 | $34,272,049 | $39,915,446 | $35,726,980 |
| Total | $194,271,825 | $175,190,862 | $232,795,154 | $284,028,350 | $251,074,384 | $237,813,567 | $280,708,820 |
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