|
| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 |
| Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ... | | $708 | | | $2,529 |
| Heterocyclic comps. cont. an unfused pyridine ring (whether or not hydrogen ... | $5,644 | $1,298 | $2,385 | $2,425 | $10,605 |
| Melamine | | | $419 | | |
| Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ... | $14,043 | $16,603 | $14,194 | $38,273 | $637 |
| 6-Hexanelactam (epsilon-caprolactam) | | | | $7,497 | $3,290 |
| Total | $19,687 | $18,609 | $16,998 | $48,195 | $17,061 |
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