| Value | Category | Cases | |
|---|---|---|---|
| 1978 | 101 |
0.9%
|
|
| 1979 | 230 |
2.1%
|
|
| 1980 | 318 |
2.9%
|
|
| 1981 | 400 |
3.7%
|
|
| 1982 | 374 |
3.4%
|
|
| 1983 | 527 |
4.8%
|
|
| 1984 | 477 |
4.4%
|
|
| 1985 | 527 |
4.8%
|
|
| 1986 | 518 |
4.8%
|
|
| 1987 | 484 |
4.4%
|
|
| 1988 | 557 |
5.1%
|
|
| 1989 | 515 |
4.7%
|
|
| 1990 | 580 |
5.3%
|
|
| 1991 | 609 |
5.6%
|
|
| 1992 | 571 |
5.2%
|
|
| 1993 | 656 |
6%
|
|
| 1994 | 608 |
5.6%
|
|
| 1995 | 616 |
5.7%
|
|
| 1996 | 685 |
6.3%
|
|
| 1997 | 688 |
6.3%
|
|
| 1998 | 549 |
5%
|
|
| 1999 | 261 |
2.4%
|
|
| 2000 | 40 |
0.4%
|
|
| 9998 | year don't know | 0 |
0%
|
| Sysmiss | 25 |