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| Both sexes | ||||||
| Duration | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 |
| Less than 3 months | 1,001 | 636 | 842 | 588 | 1,170 | 1,090 |
| 3 - 6 months | 2,787 | 1,744 | 1,274 | 1,182 | 1,620 | 1,810 |
| 6 months - 1 year | 1,911 | 1,693 | 2,186 | 1,276 | 1,520 | 1,640 |
| 1 year and over | 4,371 | 5,564 | 5,633 | 3,367 | 5,680 | 7,880 |
| Not stated | 405 | 66 | 763 | 1,146 | 1,020 | 510 |
| Total | 10,475 | 9,703 | 10,698 | 7,559 | 11,010 | 12,930 |
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