| value | category | cases | |
|---|---|---|---|
| 1970 | 1 |
6.7%
|
|
| 1972 | 1 |
6.7%
|
|
| 1973 | 1 |
6.7%
|
|
| 1974 | 1 |
6.7%
|
|
| 1975 | 3 |
20%
|
|
| 1976 | 1 |
6.7%
|
|
| 1977 | 3 |
20%
|
|
| 1978 | 2 |
13.3%
|
|
| 1980 | 1 |
6.7%
|
|
| 1986 | 1 |
6.7%
|
|
| Sysmiss | 2325 |