| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 7 |
2.6%
|
|
| 1995 | 5 |
1.8%
|
|
| 1996 | 5 |
1.8%
|
|
| 1997 | 19 |
7%
|
|
| 1998 | 63 |
23.2%
|
|
| 1999 | 99 |
36.4%
|
|
| 2000 | 74 |
27.2%
|
|
| Sysmiss | 15713 |