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| Commodity | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Phenazone (antipyrin) & its derivs. | $660 | $79 | $61 | | $3,152 | $59 |
| Heterocyclic comps. cont. an unfused pyrazole ring (whether or not hydrogen ... | $33 | | | | | |
| Hydantoin & its derivs. | | | | | | $193 |
| Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ... | $111,138 | $198,571 | $346,613 | $290,732 | $32,061 | $212,265 |
| Pyridine & its salts | $21 | $193 | | | | $123 |
| Heterocyclic comps. cont. an unfused pyridine ring (whether or not hydrogen ... | | $201,350 | $325,957 | $400,049 | $329,127 | $159,602 |
| Heterocyclic comps. cont. a pyrimidine ring (whether or not hydrogenated)/p ... | $45 | $111 | $360 | $1,513 | $113 | $307 |
| Melamine | | $7,840 | $147 | | | |
| Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ... | $956 | | $326 | $11,452 | $45 | $1,849 |
| Total | $112,853 | $408,144 | $673,464 | $703,746 | $364,498 | $374,398 |
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