| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 9 |
4.5%
|
|
| 2000 | 41 |
20.6%
|
|
| 2001 | 100 |
50.3%
|
|
| 9997 | Incohérent | 0 |
0%
|
| 9998 | NSP | 49 |
24.6%
|
| Sysmiss | 3990 |