| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 15 |
7.5%
|
|
| 2000 | 49 |
24.6%
|
|
| 2001 | 98 |
49.2%
|
|
| 9997 | Incohérent | 0 |
0%
|
| 9998 | NSP | 37 |
18.6%
|
| Sysmiss | 3990 |