| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 5 |
20.8%
|
|
| 1993 | 11 |
45.8%
|
|
| 1994 | 2 |
8.3%
|
|
| 1995 | 3 |
12.5%
|
|
| 1996 | 3 |
12.5%
|
|
| Sysmiss | 289 |