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| Commodity | 2005 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $73,827 | $253,565 | $701,913 | $343,345 | $10,124 |
| Electrical insulators, of ceramics | $3,946 | $22,285 | | $384,341 | $135,088 |
| Electrical insulators of any mat. other than glass & ceramics | $211,844 | $154,989 | $594,573 | $736,723 | $338,256 |
| Total | $289,617 | $430,839 | $1,296,486 | $1,464,409 | $483,468 |
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