Commodity2005200620072008200920102011
Phenazone (antipyrin) & its derivs. $9,554     
Heterocyclic comps. cont. an unfused pyrazole ring (whether or not hydrogen ...      $82
Hydantoin & its derivs. $227  $249$60$69
Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ... $87 $1$357$835$357
Pyridine & its salts      $275
Heterocyclic comps. cont. an unfused pyridine ring (whether or not hydrogen ...$18,167 $206$892$5,624  
Heterocyclic comps. cont. a pyrimidine ring (whether or not hydrogenated)/p ...$988$3,130$56$233$3,035$958 
Melamine $549 $1,784 $97 
Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ...   $55  $37
6-Hexanelactam (epsilon-caprolactam) $43$376$33$2,668$522$261
Lactams (excl. of 2933.71 & 2933.72)      $326
Total$19,155$13,590$638$2,998$11,933$2,472$1,407