Commodity2005200620072008200920102011
Tetrahydrofuran$149$21,674  $139$1,684$80
Heterocyclic comps. cont. an unfused furan ring (whether or not hydrogenate ...  $18,741  $18,443$25,142
Lactones (excl. coumarin, methylcoumarins & ethylcoumarins)$99$127$1,821$73  $60,924
Total$248$21,801$20,562$73$139$20,127$86,146