| 1968 | 1990 | Evolution | Structure | |||
| brute | % | En 1968 | en 1990 | |||
| Agriculture, sylviculture, pêche | 2236 | 1868 | -368 | -16,46% | 5,62% | 3,08% |
| Industrie | 16148 | 17679 | 1531 | 9,48% | 40,55% | 29,11% |
| Bâtiment et travaux publics | 3812 | 4456 | 644 | 16,89% | 9,57% | 7,34% |
| Commerce | 4920 | 7716 | 2796 | 56,83% | 12,36% | 12,71% |
| Transports et télécommunications | 2424 | 5080 | 2656 | 109,57% | 6,09% | 8,37% |
| Services marchands | 4392 | 11480 | 7088 | 161,38% | 11,03% | 18,90% |
| Services non marchands | 3072 | 9532 | 6460 | 210,29% | 7,71% | 15,70% |
| Autres | 2816 | 2916 | 100 | 3,55% | 7,07% | 4,80% |
| 39820 | 60727 | 20907 | 52,50% | 100% | 100% | |