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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Heterocyclic comps. cont. an unfused pyrazole ring (whether or not hydrogen ... | | | $381 | | | |
| Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ... | | $2,214 | | | | |
| Heterocyclic comps. cont. an unfused pyridine ring (whether or not hydrogen ... | $8,479 | $8,951 | | $15,648 | $9,595 | $1,130 |
| Heterocyclic comps. cont. a pyrimidine ring (whether or not hydrogenated)/p ... | | | | | | $706 |
| Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ... | | | | $54 | $1,480 | |
| 6-Hexanelactam (epsilon-caprolactam) | | $1,719 | | | | |
| Total | $8,479 | $12,884 | $381 | $15,702 | $11,075 | $1,836 |
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