| Value | Category | Cases | |
|---|---|---|---|
| 1973 | 1 |
8.3%
|
|
| 1976 | 1 |
8.3%
|
|
| 1984 | 1 |
8.3%
|
|
| 1985 | 2 |
16.7%
|
|
| 1989 | 1 |
8.3%
|
|
| 1992 | 2 |
16.7%
|
|
| 1993 | 4 |
33.3%
|
|
| Sysmiss | 19 |