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| Both sexes | |||||||||
| Educational attainment | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 |
| No formal education | n.a. | 465 | 440 | 355 | 285 | 275 | 810 | 725 | 960 |
| Elementary/primary | n.a. | 3,445 | 3,490 | 4,900 | 4,290 | 4,415 | 5,735 | 7,050 | 6,105 |
| Secondary/high | n.a. | 7,165 | 9,590 | 10,620 | 9,910 | 12,610 | 10,545 | 10,875 | 7,965 |
| College/university | n.a. | 485 | 645 | 675 | 675 | 1,305 | 655 | 595 | 565 |
| Technical/vocational | n.a. | 515 | 495 | 320 | 320 | 405 | 535 | 625 | 350 |
| Not stated | n.a. | 40 | 0 | 0 | 110 | 90 | 120 | 30 | 55 |
| Total |   | 12,115 | 14,660 | 16,870 | 15,590 | 19,100 | 18,400 | 19,900 | 16,000 |
| Male | |||||||||
| Educational attainment | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 |
| No formal education | n.a. | 120 | 195 | 115 | 110 | 80 | 450 | 220 | 560 |
| Elementary/primary | n.a. | 1,305 | 1,775 | 2,045 | 2,685 | 2,410 | 3,385 | 3,995 | 3,505 |
| Secondary/high | n.a. | 2,780 | 3,955 | 4,085 | 4,190 | 6,210 | 4,975 | 4,905 | 3,670 |
| College/university | n.a. | 155 | 180 | 225 | 255 | 325 | 365 | 325 | 270 |
| Technical/vocational | n.a. | 275 | 375 | 150 | 145 | 285 | 245 | 255 | 270 |
| Not stated | n.a. | 40 | 0 | 0 | 75 | 90 | 80 | 25 | |
| Total |   | 4,675 | 6,480 | 6,620 | 7,460 | 9,400 | 9,500 | 9,700 | 8,300 |
| Female | |||||||||
| Educational attainment | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 |
| No formal education | n.a. | 220 | 240 | 240 | 175 | 195 | 360 | 505 | 400 |
| Elementary/primary | n.a. | 2,140 | 1,710 | 2,855 | 1,605 | 2,005 | 2,350 | 3,055 | 2,600 |
| Secondary/high | n.a. | 4,505 | 5,660 | 6,535 | 5,720 | 6,400 | 5,570 | 5,970 | 4,295 |
| College/university | n.a. | 335 | 460 | 450 | 420 | 980 | 290 | 270 | 295 |
| Technical/vocational | n.a. | 240 | 110 | 170 | 175 | 120 | 290 | 370 | 80 |
| Not stated | n.a. | 0 | 0 | 0 | 35 | 0 | 40 | 30 | 30 |
| Total |   | 7,440 | 8,180 | 10,250 | 8,130 | 9,700 | 8,900 | 10,200 | 7,700 |
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