| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 29 |
33.3%
|
|
| 2003 | 4 |
4.6%
|
|
| 2004 | 16 |
18.4%
|
|
| 2005 | 38 |
43.7%
|
|
| Sysmiss | 12 |