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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $73,064 | $32,444 | $46,007 | $19,590 | $127,883 | $127,532 | $1,783 |
| Electrical insulators, of ceramics | $292,145 | $661,480 | $1,169,473 | $626,908 | $647,109 | $1,505,156 | $1,129,650 |
| Electrical insulators of any mat. other than glass & ceramics | $568,319 | $248,784 | $1,473,420 | $4,357,442 | $2,123,931 | $330,994 | $58,180 |
| Total | $933,528 | $942,708 | $2,688,900 | $5,003,940 | $2,898,923 | $1,963,682 | $1,189,613 |
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