| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 9 |
15%
|
|
| 2003 | 28 |
46.7%
|
|
| 2004 | 19 |
31.7%
|
|
| 2005 | 4 |
6.7%
|
|
| Sysmiss | 6710 |