| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 28 |
4.4%
|
|
| 1993 | 76 |
11.9%
|
|
| 1994 | 85 |
13.3%
|
|
| 1995 | 102 |
16%
|
|
| 1996 | 163 |
25.5%
|
|
| 1997 | 182 |
28.5%
|
|
| 1998 | 3 |
0.5%
|
|
| Sysmiss | 9717 |