| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
8.3%
|
|
| 2001 | 3 |
25%
|
|
| 2002 | 7 |
58.3%
|
|
| 2003 | 1 |
8.3%
|
|
| Sysmiss | 384 |