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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $562,778 | $1,058,056 | $4,442,158 | $981,211 | $4,008,954 | $6,125,400 | $3,850,552 |
| Electrical insulators, of ceramics | $4,089,101 | $4,198,961 | $6,630,360 | $4,718,815 | $5,908,503 | $6,605,794 | $8,081,598 |
| Electrical insulators of any mat. other than glass & ceramics | $1,057,580 | $1,357,346 | $1,160,671 | $1,337,262 | $1,952,789 | $1,703,902 | $5,004,683 |
| Total | $5,709,459 | $6,614,363 | $12,233,189 | $7,037,288 | $11,870,246 | $14,435,096 | $16,936,833 |
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