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| Commodity | 2005 | 2007 | 2008 | 2009 |
| Polystyrene, expansible, in primary forms | $106 | | | |
| Styrene-acrylonitrile (SAN) copolymers, in primary forms | | | $14,228 | |
| Acrylonitrile-butadiene-styrene (ABS) copolymers, in primary forms | | $12,747 | | |
| Polymers of styrene, in primary forms (excl. of 3903.11-3903.30) | | | | $37,482 |
| Total | $106 | $12,747 | $14,228 | $37,482 |
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