| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 1 |
14.3%
|
|
| 1986 | 1 |
14.3%
|
|
| 1987 | 1 |
14.3%
|
|
| 1990 | 2 |
28.6%
|
|
| 1993 | 1 |
14.3%
|
|
| 1994 | 1 |
14.3%
|
|
| Sysmiss | 24 |