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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Heterocyclic comps. cont. an unfused pyrazole ring (whether or not hydrogen ... | $29,093 | | | | $36,589 | | |
| Hydantoin & its derivs. | $11,024 | $13,622 | $7,588 | | | | |
| Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ... | | | | | $461 | $681 | $258 |
| Pyridine & its salts | | | | | $5,423 | $1,074 | $2,694 |
| Heterocyclic comps. cont. an unfused pyridine ring (whether or not hydrogen ... | $1,449 | $311 | $50,904 | $153,798 | $83,942 | $44,701 | $249,314 |
| Heterocyclic comps. cont. a pyrimidine ring (whether or not hydrogenated)/p ... | $375 | | | | $174 | $88 | $756 |
| Melamine | | | $75,497 | | $534 | $37,228 | $4,726 |
| Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ... | $128,675 | $104,064 | $48,159 | $398,600 | $542,687 | $497,408 | $413,093 |
| Lactams (excl. of 2933.71 & 2933.72) | | | $726 | | $1,759 | | $5,780 |
| Total | $170,616 | $117,997 | $182,874 | $552,398 | $671,569 | $581,180 | $676,621 |
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