| 1968 | 1990 | Evolution | Structure | |||
| brute | % | En 1968 | en 1990 | |||
| Agriculture, sylviculture, pêche | 3944 | 2376 | -1568 | -39,76% | 3,92% | 1,97% |
| Industrie agro-alimentaire | 2064 | 3976 | 1912 | 92,64% | 2,05% | 3,30% |
| Industrie | 53016 | 38760 | -14256 | -26,89% | 52,74% | 32,16% |
| Bâtiment et travaux publics | 8972 | 9284 | 312 | 3,48% | 8,93% | 7,70% |
| Commerce | 12036 | 13720 | 1684 | 13,99% | 11,97% | 11,38% |
| Transports et télécommunications | 3464 | 5504 | 2040 | 58,89% | 3,45% | 4,57% |
| Services marchands | 9924 | 26736 | 16812 | 169,41% | 9,87% | 22,18% |
| Services non marchands | 6040 | 18460 | 12420 | 205,63% | 6,01% | 15,32% |
| Autres | 1064 | 1700 | 636 | 59,77% | 1,06% | 1,41% |
| 100524 | 120516 | 19992 | 19,89% | 100% | 100% | |