| value | category | cases | |
|---|---|---|---|
| 1976 | 40 |
0.8%
|
|
| 1977 | 338 |
6.6%
|
|
| 1978 | 286 |
5.6%
|
|
| 1979 | 378 |
7.3%
|
|
| 1980 | 441 |
8.6%
|
|
| 1981 | 441 |
8.6%
|
|
| 1982 | 480 |
9.3%
|
|
| 1983 | 688 |
13.4%
|
|
| 1984 | 611 |
11.9%
|
|
| 1985 | 750 |
14.6%
|
|
| 1986 | 694 |
13.5%
|
|
| 2222 | 3 |
0.1%
|
|
| Sysmiss | 1509 |