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| Commodity | 2005 | 2007 | 2008 |
| Phenazone (antipyrin) & its derivs. | $28,451 | $8,571 | $175,443 |
| Heterocyclic comps. cont. an unfused pyrazole ring (whether or not hydrogen ... | $15,837 | $18,272 | $81,582 |
| Hydantoin & its derivs. | $99,395 | $13,391 | $69,719 |
| Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ... | $712,222 | $666,796 | $370,692 |
| Pyridine & its salts | $99,703 | $256,009 | $212,087 |
| Heterocyclic comps. cont. an unfused pyridine ring (whether or not hydrogen ... | $1,199,744 | $2,166,577 | $2,124,253 |
| Heterocyclic comps. cont. a pyrimidine ring (whether or not hydrogenated)/p ... | $486,432 | $237,855 | $454,190 |
| Melamine | $497,108 | $1,251,602 | $1,733,289 |
| Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ... | $2,628,929 | $3,939,925 | $4,740,877 |
| 6-Hexanelactam (epsilon-caprolactam) | $91,588 | $122,072 | $84,540 |
| Lactams (excl. of 2933.71 & 2933.72) | $501,103 | $676,138 | $505,016 |
| Total | $6,360,512 | $9,357,208 | $10,551,688 |
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