|
| Commodity | 2005 | 2006 | 2007 | 2008 |
| Heterocyclic comps. cont. an unfused pyrazole ring (whether or not hydrogen ... | | | $2,610 | |
| Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ... | | | $477 | |
| Heterocyclic comps. cont. a pyrimidine ring (whether or not hydrogenated)/p ... | $176 | | | $1,321 |
| Melamine | | | | $501 |
| Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ... | $5,375 | $28,946 | $18,006 | $34,517 |
| Lactams (excl. of 2933.71 & 2933.72) | $56 | | | |
| Total | $5,607 | $28,946 | $21,093 | $36,339 |
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