| value | category | cases | |
|---|---|---|---|
| 1971 | 3 |
16.7%
|
|
| 1972 | 2 |
11.1%
|
|
| 1973 | 2 |
11.1%
|
|
| 1974 | 2 |
11.1%
|
|
| 1975 | 3 |
16.7%
|
|
| 1976 | 1 |
5.6%
|
|
| 1977 | 1 |
5.6%
|
|
| 1978 | 1 |
5.6%
|
|
| 1980 | 1 |
5.6%
|
|
| 1981 | 1 |
5.6%
|
|
| 1986 | 1 |
5.6%
|
|
| Sysmiss | 12459 |