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| Both sexes | ||||||||||
| Educational attainment | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 | |
| No formal education | n.a. | 3,380 | 2,960 | 2,390 | 1,895 | 1,485 | 3,995 | 3,315 | 5,010 | |
| Elementary/primary | n.a. | 33,180 | 31,090 | 36,810 | 29,960 | 28,390 | 34,260 | 34,850 | 41,925 | |
| Secondary/high | n.a. | 87,930 | 85,925 | 83,635 | 83,970 | 87,755 | 78,705 | 73,220 | 65,260 | |
| College/university | n.a. | 23,345 | 22,125 | 17,730 | 22,625 | 20,260 | 15,850 | 15,285 | 13,735 | |
| Technical/vocational | n.a. | 8,075 | 7,515 | 5,045 | 3,855 | 4,915 | 6,420 | 6,585 | 3,745 | |
| Not stated | n.a. | 560 | 300 | 1,025 | 725 | 895 | 970 | 1,345 | 725 | |
| Total |   | 156,470 | 149,915 | 146,635 | 143,030 | 143,700 | 140,200 | 134,600 | 130,400 | |
| Male | ||||||||||
| Educational attainment | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 | |
| No formal education | n.a. | 2,070 | 1,515 | 1,560 | 1,095 | 860 | 2,160 | 1,920 | 3,495 | |
| Elementary/primary | n.a. | 19,015 | 18,680 | 21,855 | 17,790 | 16,510 | 20,910 | 21,045 | 24,290 | |
| Secondary/high | n.a. | 42,720 | 43,655 | 41,740 | 42,210 | 44,820 | 40,070 | 35,825 | 31,155 | |
| College/university | n.a. | 10,515 | 9,645 | 8,275 | 10,180 | 9,835 | 6,970 | 7,115 | 6,250 | |
| Technical/vocational | n.a. | 4,545 | 4,150 | 2,895 | 2,115 | 2,375 | 3,220 | 3,435 | 2,095 | |
| Not stated | n.a. | 360 | 150 | 675 | 585 | 500 | 570 | 760 | 415 | |
| Total |   | 79,225 | 77,795 | 77,000 | 73,975 | 74,900 | 73,900 | 70,100 | 67,700 | |
| Female | ||||||||||
| Educational attainment | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 | |
| No formal education | n.a. | 1,310 | 1,440 | 830 | 800 | 625 | 1,835 | 1,395 | 1,515 | |
| Elementary/primary | n.a. | 14,165 | 12,405 | 14,955 | 12,170 | 11,880 | 13,350 | 13,805 | 17,635 | |
| Secondary/high | n.a. | 45,210 | 42,270 | 41,895 | 41,760 | 42,935 | 38,635 | 37,395 | 34,105 | |
| College/university | n.a. | 12,825 | 12,480 | 9,455 | 12,445 | 10,425 | 8,880 | 8,170 | 7,485 | |
| Technical/vocational | n.a. | 3,530 | 3,370 | 2,150 | 1,740 | 2,540 | 3,200 | 3,150 | 1,650 | |
| Not stated | n.a. | 205 | 155 | 350 | 140 | 395 | 400 | 585 | 310 | |
| Total |   | 77,245 | 72,120 | 69,635 | 69,055 | 68,800 | 66,300 | 64,500 | 62,700 |
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