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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $24,566,719 | $25,425,223 | $23,899,046 | $25,695,816 | $16,215,596 | $19,142,090 | $18,146,746 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $10,873,863 | $10,657,592 | $16,507,745 | $14,649,635 | $12,750,473 | $10,557,842 | $11,998,689 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $594,924 | $1,042,110 | $1,585,276 | $664,943 | $1,967,992 | $2,924,502 | $1,739,297 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $31,101,849 | $30,156,461 | $28,199,399 | $33,051,403 | $31,303,328 | $33,569,552 | $42,255,166 |
| Total | $67,137,355 | $67,281,386 | $70,191,466 | $74,061,797 | $62,237,389 | $66,193,986 | $74,139,898 |
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