| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
7.1%
|
|
| 1995 | 2 |
14.3%
|
|
| 1996 | 7 |
50%
|
|
| 1997 | 4 |
28.6%
|
|
| Sysmiss | 9837 |