| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
4.5%
|
|
| 2001 | 4 |
18.2%
|
|
| 2002 | 16 |
72.7%
|
|
| 2003 | 1 |
4.5%
|
|
| Sysmiss | 374 |