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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Heterocyclic comps. cont. an unfused pyrazole ring (whether or not hydrogen ... | | | | $5,671 | | $909 | $9,862 |
| Hydantoin & its derivs. | | $6,169 | | | | | |
| Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ... | | | | | $6,882 | $8,634 | $9,615 |
| Heterocyclic comps. cont. an unfused pyridine ring (whether or not hydrogen ... | | $33,396 | $20,305 | | $86,735 | $22,857 | $4,284 |
| Heterocyclic comps. cont. a pyrimidine ring (whether or not hydrogenated)/p ... | $4,358 | $5,203 | | $7,641 | $2,297 | $5,610 | $31,369 |
| Melamine | $46,000 | | | | $2,622 | $55 | $115,652 |
| Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ... | $166 | | | | $894 | | |
| Lactams (excl. of 2933.71 & 2933.72) | | | | | | $6,750 | |
| Total | $50,524 | $44,768 | $20,305 | $13,312 | $99,430 | $44,815 | $170,782 |
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