| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 38 |
5.4%
|
|
| 1993 | 79 |
11.2%
|
|
| 1994 | 85 |
12%
|
|
| 1995 | 127 |
18%
|
|
| 1996 | 173 |
24.5%
|
|
| 1997 | 201 |
28.5%
|
|
| 1998 | 3 |
0.4%
|
|
| Sysmiss | 9650 |