| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 8 |
12.5%
|
|
| 1995 | 29 |
45.3%
|
|
| 1996 | 22 |
34.4%
|
|
| 1997 | 5 |
7.8%
|
|
| Sysmiss | 9787 |