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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $44,068 | $276 | $900 | $423,560 | $79,986 | $265,955 | $50,725 |
| Electrical insulators, of ceramics | $352,870 | $408,075 | $388,786 | $848,981 | $231,839 | $319,772 | $252,613 |
| Electrical insulators of any mat. other than glass & ceramics | $718,715 | $897,224 | $1,760,223 | $1,203,722 | $830,215 | $993,477 | $1,835,945 |
| Total | $1,115,653 | $1,305,575 | $2,149,909 | $2,476,263 | $1,142,040 | $1,579,204 | $2,139,283 |
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