| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 1 |
16.7%
|
|
| 1993 | 1 |
16.7%
|
|
| 1999 | 1 |
16.7%
|
|
| 2002 | 3 |
50%
|
|
| Sysmiss | 278 |