| value | category | cases | |
|---|---|---|---|
| 1969 | 1 |
3.2%
|
|
| 1971 | 1 |
3.2%
|
|
| 1974 | 2 |
6.5%
|
|
| 1975 | 3 |
9.7%
|
|
| 1976 | 3 |
9.7%
|
|
| 1978 | 11 |
35.5%
|
|
| 1979 | 1 |
3.2%
|
|
| 1980 | 3 |
9.7%
|
|
| 1981 | 3 |
9.7%
|
|
| 1983 | 2 |
6.5%
|
|
| 1986 | 1 |
3.2%
|
|
| Sysmiss | 2309 |