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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $10,853,793 | $8,987,211 | $12,657,427 | $14,090,986 | $12,755,323 | $9,641,516 | $14,117,404 |
| Electrical insulators, of ceramics | $22,844,852 | $24,505,782 | $22,352,946 | $25,713,876 | $20,175,340 | $19,825,152 | $18,930,345 |
| Electrical insulators of any mat. other than glass & ceramics | $32,970,745 | $31,256,862 | $39,613,823 | $45,953,736 | $37,154,216 | $32,961,949 | $31,308,467 |
| Total | $66,669,390 | $64,749,855 | $74,624,196 | $85,758,598 | $70,084,879 | $62,428,617 | $64,356,216 |
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