| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 9 |
3.1%
|
|
| 1998 | 25 |
8.6%
|
|
| 1999 | 38 |
13.1%
|
|
| 2000 | 30 |
10.3%
|
|
| 2001 | 93 |
32%
|
|
| 2002 | 96 |
33%
|
|
| Sysmiss | 1232 |