| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 1 |
16.7%
|
|
| 1988 | 2 |
33.3%
|
|
| 1989 | 1 |
16.7%
|
|
| 1992 | 1 |
16.7%
|
|
| 1996 | 1 |
16.7%
|
|
| Sysmiss | 5554 |