| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 14 |
3%
|
|
| 1999 | 94 |
20.1%
|
|
| 2000 | 102 |
21.8%
|
|
| 2001 | 108 |
23.1%
|
|
| 2002 | 144 |
30.8%
|
|
| 2003 | 6 |
1.3%
|
|
| Sysmiss | 531 |