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| Both sexes | |||||||||
| Educational attainment | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 |
| No formal education | n.a. | 2,915 | 2,515 | 2,035 | 1,610 | 1,210 | 3,185 | 2,590 | 4,050 |
| Elementary/primary | n.a. | 29,735 | 27,600 | 31,910 | 25,670 | 23,975 | 28,525 | 27,800 | 35,820 |
| Secondary/high | n.a. | 80,765 | 76,330 | 73,015 | 74,060 | 75,145 | 68,160 | 62,345 | 57,295 |
| College/university | n.a. | 22,855 | 21,480 | 17,055 | 21,950 | 18,955 | 15,195 | 14,690 | 13,170 |
| Technical/vocational | n.a. | 7,555 | 7,025 | 4,725 | 3,535 | 4,510 | 5,885 | 5,960 | 3,395 |
| Not stated | n.a. | 530 | 305 | 1,025 | 615 | 805 | 850 | 1,315 | 670 |
| Total |   | 144,355 | 135,255 | 129,765 | 127,440 | 124,600 | 121,800 | 114,700 | 114,400 |
| Male | |||||||||
| Educational attainment | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 |
| No formal education | n.a. | 1,950 | 1,320 | 1,445 | 985 | 780 | 1,710 | 1,700 | 2,935 |
| Elementary/primary | n.a. | 17,715 | 16,905 | 19,810 | 15,105 | 14,100 | 17,525 | 17,050 | 20,785 |
| Secondary/high | n.a. | 40,065 | 39,695 | 37,655 | 38,020 | 38,610 | 35,095 | 30,920 | 27,485 |
| College/university | n.a. | 10,365 | 9,470 | 8,050 | 9,925 | 9,510 | 6,605 | 6,790 | 5,980 |
| Technical/vocational | n.a. | 4,270 | 3,775 | 2,745 | 1,970 | 2,090 | 2,975 | 3,180 | 1,825 |
| Not stated | n.a. | 325 | 150 | 675 | 510 | 410 | 490 | 760 | 390 |
| Total |   | 74,690 | 71,315 | 70,380 | 66,515 | 65,500 | 64,400 | 60,400 | 59,400 |
| Female | |||||||||
| Educational attainment | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 |
| No formal education | n.a. | 965 | 1,195 | 590 | 625 | 430 | 1,475 | 890 | 1,115 |
| Elementary/primary | n.a. | 12,020 | 10,695 | 12,100 | 10,565 | 9,875 | 11,000 | 10,750 | 15,035 |
| Secondary/high | n.a. | 40,700 | 36,635 | 35,360 | 36,040 | 36,535 | 33,065 | 31,425 | 29,810 |
| College/university | n.a. | 12,490 | 12,010 | 9,005 | 12,025 | 9,445 | 8,590 | 7,900 | 7,190 |
| Technical/vocational | n.a. | 3,285 | 3,255 | 1,980 | 1,565 | 2,420 | 2,910 | 2,780 | 1,570 |
| Not stated | n.a. | 205 | 150 | 350 | 105 | 395 | 360 | 555 | 280 |
| Total |   | 69,665 | 63,940 | 59,385 | 60,925 | 59,100 | 57,400 | 54,300 | 55,000 |
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