| 1968 | 1990 | Evolution | Structure | |||
| brute | % | en 1968 | en 1990 | |||
| Agriculture, sylviculture, pêche | 45900 | 18012 | -27888 | -60,76% | 42,84% | 22,42% |
| Industrie agro-alimentaire | 2688 | 3164 | 476 | 17,71% | 2,51% | 3,94% |
| Industrie | 23668 | 15677 | -7991 | -33,76% | 22,09% | 19,51% |
| Bâtiment et travaux publics | 9412 | 8768 | -644 | -6,84% | 8,78% | 10,91% |
| Commerce | 10292 | 5372 | -4920 | -47,80% | 9,61% | 6,69% |
| Transports et télécommunications | 3748 | 4673 | 925 | 24,68% | 3,50% | 5,82% |
| Services marchands | 6724 | 13348 | 6624 | 98,51% | 6,28% | 16,61% |
| Services non marchands | 4424 | 8700 | 4276 | 96,65% | 4,13% | 10,83% |
| Autres | 284 | 2640 | 2356 | 829,58% | 0,27% | 3,29% |
| Totaux | 107140 | 80354 | -26786 | -25,00% | 100% | 100% |