| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 1 |
16.7%
|
|
| 1999 | 1 |
16.7%
|
|
| 2001 | 2 |
33.3%
|
|
| 2002 | 2 |
33.3%
|
|
| Sysmiss | 8043 |