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| Commodity | 2006 | 2007 | 2008 |
| Line pipe of a kind used for oil/gas pipelines, having circular cross-secti ... | $3,192,708 | $3,962,845 | $44,420,628 |
| Line pipe of a kind used for oil/gas pipelines, having circular cross-secti ... | $59,028,715 | $25,924,296 | $15,524,298 |
| Line pipe of a kind used for oil/gas pipelines, having circular cross-secti ... | $6,265,941 | $40,643,312 | $34,035,744 |
| Casing of a kind used in drilling for oil/gas, having circular cross-sectio ... | $10,198,535 | $104,319,738 | $13,994,687 |
| Tubes & pipes (excl. of 7305.11-7305.20), having circular cross-sections, t ... | $18,528,177 | | $36,271,328 |
| Tubes & pipes (excl. of 7305.11-7305.20), having circular cross-sections, t ... | $1,330,535 | $6,756,950 | $1,831,347 |
| Tubes & pipes (e.g., welded/riveted/similarly closed), having circular cros ... | $4,074,564 | $7,522,553 | $9,614,368 |
| Total | $102,619,175 | $189,129,694 | $155,692,400 |
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