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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $497,338 | $135,285 | $172,569 | $45,670 | $93,155 | $1,452,989 | $1,721,664 |
| Electrical insulators, of ceramics | $5,501,930 | $3,813,062 | $3,439,251 | $3,851,185 | $2,787,684 | $4,526,634 | $3,438,360 |
| Electrical insulators of any mat. other than glass & ceramics | $6,595,722 | $8,603,189 | $6,222,274 | $9,263,275 | $7,684,350 | $8,444,990 | $12,111,355 |
| Total | $12,594,990 | $12,551,536 | $9,834,094 | $13,160,130 | $10,565,189 | $14,424,613 | $17,271,379 |
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