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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $458,718 | $1,677,619 | $4,638,380 | $6,512,588 | $2,614,579 | $1,112,498 | $3,131,026 |
| Electrical insulators, of ceramics | $5,752,673 | $7,419,877 | $15,826,074 | $30,793,403 | $23,241,278 | $27,036,274 | $42,474,182 |
| Electrical insulators of any mat. other than glass & ceramics | $11,739,771 | $14,358,042 | $21,467,611 | $22,422,682 | $42,593,399 | $48,038,011 | $60,043,112 |
| Total | $17,951,162 | $23,455,538 | $41,932,065 | $59,728,673 | $68,449,256 | $76,186,783 | $105,648,320 |
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