| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 26 |
11.3%
|
|
| 2001 | 27 |
11.7%
|
|
| 2002 | 50 |
21.7%
|
|
| 2003 | 73 |
31.7%
|
|
| 2004 | 54 |
23.5%
|
|
| Sysmiss | 1401 |