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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $68,245 | $778,319 | $62,961 | $4,226 | $32,177 | $142,833 | $156,064 |
| Electrical insulators, of ceramics | $1,922,518 | $2,576,480 | $3,896,415 | $4,912,990 | $3,768,285 | $2,548,090 | $3,541,751 |
| Electrical insulators of any mat. other than glass & ceramics | $3,002,886 | $3,801,081 | $2,604,995 | $3,893,296 | $1,667,405 | $2,443,077 | $3,552,410 |
| Total | $4,993,649 | $7,155,880 | $6,564,371 | $8,810,512 | $5,467,867 | $5,134,000 | $7,250,225 |
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