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| Commodity | 2006 | 2007 | 2008 | 2009 | 2010 |
| Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ... | | $206,589 | $3,068 | | $5,716 |
| Heterocyclic comps. cont. an unfused pyridine ring (whether or not hydrogen ... | $2,089 | $6,488 | $4,192 | $6 | |
| Heterocyclic comps. cont. a pyrimidine ring (whether or not hydrogenated)/p ... | | | $34,132 | $349 | |
| Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ... | $25,300 | | | $4,612 | $4,209 |
| Lactams (excl. of 2933.71 & 2933.72) | $33,630 | | | | |
| Total | $61,019 | $213,077 | $41,392 | $4,967 | $9,925 |
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