| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 1 |
0.5%
|
|
| 1993 | 1 |
0.5%
|
|
| 1994 | 53 |
25.4%
|
|
| 1995 | 12 |
5.7%
|
|
| 1996 | 13 |
6.2%
|
|
| 1997 | 129 |
61.7%
|
|
| Sysmiss | 101 |