| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 19 |
9.5%
|
|
| 2000 | 58 |
29.1%
|
|
| 2001 | 120 |
60.3%
|
|
| 9997 | Incohérent | 0 |
0%
|
| 9998 | NSP | 2 |
1%
|
| Sysmiss | 3990 |