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| Year | 1982 | 1995 | 2007 |
|---|---|---|---|
| No education | 23,80% | 2,91% | 1,02% |
| Basic Education School Graduate Certificate | 2,38% | 4,54% | 3,40% |
| Upper Secondary Education and University Orientation Course | 21,42% | 14,77% | 12,24% |
| University Graduates | 35,71% | 64,20% | 68,70% |
| Engineers | 9,52% | 4,54% | 2,72% |
| Vocational Training | 10,22% | 11,90% | |
| Technical engineers | 7,14% |