| | 2004 | | | Rank | Principal of industry | Factories | | 1 | Petroleum products | 335 | | 2 | Beverage | 388 | | 3 | Basic metal products | 1,021 | | 4 | Leather products & foodwear | 1,093 | | 5 | Paper & paper products | 1,104 | | 6 | Rubber products | 1,958 | | 7 | Chemical & chemical products | 1,972 | | 8 | Electrical machineery and supplies | 2,113 | | 9 | Printing, publishing, allied products | 2,145 | | 10 | Wearing apparel | 2,522 | | | Total | 120,145 |
| | | 2005 | | | Rank | Principal of industry | Factories | | 1 | Petroleum products | 368 | | 2 | Beverage | 407 | | 3 | Basic metal products | 1,056 | | 4 | Leather products & foodwear | 1,078 | | 5 | Paper & paper products | 1,171 | | 6 | Rubber products | 2,027 | | 7 | Printing, publishing, allied products | 2,195 | | 8 | Electrical machineery and supplies | 2,209 | | 9 | Chemical & chemical products | 2,212 | | 10 | Wearing apparel | 2,545 | | | Total | 122,312 |
| | | 2006 | | | Rank | Principal of industry | Factories | | 1 | Petroleum products | 387 | | 2 | Beverage | 417 | | 3 | Basic metal products | 1,082 | | 4 | Leather products & foodwear | 1,094 | | 5 | Paper & paper products | 1,212 | | 6 | Rubber products | 2,067 | | 7 | Printing, publishing, allied products | 2,273 | | 8 | Electrical machineery and supplies | 2,316 | | 9 | Chemical & chemical products | 2,329 | | 10 | Wearing apparel | 2,582 | | | Total | 125,347 |
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