Commodity200520062007200820092010
Tetrahydrofuran$1,119$170$923$1,102  
Heterocyclic comps. cont. an unfused furan ring (whether or not hydrogenate ... $647    
Lactones (excl. coumarin, methylcoumarins & ethylcoumarins)$1,051$1,509$861$12,258$1,269$1,284
Total$2,170$2,326$1,784$13,360$1,269$1,284