Commodity2005200620072008200920102011
Tetrahydrofuran$5$322$992$1,081   
Heterocyclic comps. cont. an unfused furan ring (whether or not hydrogenate ...$5     $2,000
Coumarin, methylcoumarins & ethylcoumarins $252     
Lactones (excl. coumarin, methylcoumarins & ethylcoumarins)$9$12$368$161$4,880$831 
Total$19$586$1,360$1,242$4,880$831$2,000