Commodity200520062007200820092010
Tetrahydrofuran$753 $1,063$695$3,741$663
Heterocyclic comps. cont. an unfused furan ring (whether or not hydrogenate ... $1,924$32,337  $38
Lactones (excl. coumarin, methylcoumarins & ethylcoumarins) $33$11,101$5,341$3,083$1,645
Total$753$1,957$44,501$6,036$6,824$2,346