| 1968 | 1990 | Evolution | Structure | |||
| brute | % | En 1968 | en 1990 | |||
| Industrie agro-alimentaire | 2868 | 3036 | 168 | 5,86% | 2,21% | 2,43% |
| Production et distribution d'énergie | 7224 | 1360 | -5864 | -81,17% | 5,57% | 1,09% |
| Industrie | 50372 | 29269 | -21103 | -41,89% | 38,86% | 23,46% |
| Bâtiment et travaux publics | 14068 | 7880 | -6188 | -43,99% | 10,85% | 6,32% |
| Commerce | 20492 | 17264 | -3228 | -15,75% | 15,81% | 13,84% |
| Transports et télécommunications | 6464 | 7160 | 696 | 10,77% | 4,99% | 5,74% |
| Services marchands | 15664 | 33000 | 17336 | 110,67% | 12,09% | 26,46% |
| Services non marchands | 11388 | 25172 | 13784 | 121,04% | 8,79% | 20,18% |
| Autres | 1072 | 596 | -476 | -44,40% | 0,83% | 0,48% |
| 129612 | 124737 | -4875 | -3,76% | 100% | 100% | |