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| Both sexes | ||||||||
| Duration | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 |
| Less than 1 month | 495 | 525 | 675 | 590 | 290 | 360 | 340 | 460 |
| 1-3 months | 1,045 | 890 | 1,435 | 1,200 | 1,050 | 710 | 710 | 1,600 |
| 4-6 months | 1,010 | 1,255 | 1,030 | 980 | 660 | 860 | 830 | 890 |
| More than 6 months | 9,760 | 10,385 | 11,770 | 11,120 | 8,810 | 8,350 | 8,390 | 7,430 |
| Not stated | 225 | 165 | 635 | 500 | 270 | 550 | 440 | 250 |
| Total | 12,535 | 13,220 | 15,545 | 14,380 | 11,060 | 10,810 | 10,720 | 10,620 |
| Male | ||||||||
| Duration | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 |
| Less than 1 month | 200 | 280 | 380 | 410 | 240 | 220 | 210 | 220 |
| 1-3 months | 520 | 490 | 865 | 810 | 490 | 440 | 350 | 720 |
| 4-6 months | 525 | 735 | 335 | 580 | 320 | 420 | 420 | 430 |
| More than 6 months | 3,710 | 4,520 | 5,115 | 4,850 | 3,910 | 3,030 | 2,970 | 2,650 |
| Not stated | 115 | 40 | 380 | 130 | 120 | 160 | 180 | 70 |
| Total | 5,070 | 6,065 | 7,075 | 6,780 | 5,080 | 4,260 | 4,130 | 4,090 |
| Female | ||||||||
| Duration | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 |
| Less than 1 month | 295 | 245 | 295 | 180 | 40 | 140 | 130 | 230 |
| 1-3 months | 525 | 400 | 570 | 390 | 560 | 270 | 360 | 870 |
| 4-6 months | 485 | 520 | 695 | 390 | 340 | 440 | 420 | 470 |
| More than 6 months | 6,050 | 5,865 | 6,655 | 6,270 | 4,900 | 5,320 | 5,420 | 4,780 |
| Not stated | 110 | 125 | 255 | 370 | 150 | 380 | 260 | 180 |
| Total | 7,465 | 7,155 | 8,470 | 7,600 | 5,980 | 6,560 | 6,590 | 6,530 |
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