| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 3 |
3.4%
|
|
| 2002 | 6 |
6.8%
|
|
| 2003 | 25 |
28.4%
|
|
| 2004 | 54 |
61.4%
|
|
| Sysmiss | 279 |