| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 11 |
2.2%
|
|
| 1993 | 44 |
9%
|
|
| 1994 | 65 |
13.2%
|
|
| 1995 | 98 |
20%
|
|
| 1996 | 128 |
26.1%
|
|
| 1997 | 144 |
29.3%
|
|
| 1998 | 1 |
0.2%
|
|
| Sysmiss | 9865 |