| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 4 |
44.4%
|
|
| 1995 | 3 |
33.3%
|
|
| 1996 | 1 |
11.1%
|
|
| 1997 | 1 |
11.1%
|
|
| Sysmiss | 22 |