| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 12 |
6%
|
|
| 2000 | 47 |
23.6%
|
|
| 2001 | 106 |
53.3%
|
|
| 9997 | Incohérent | 0 |
0%
|
| 9998 | NSP | 34 |
17.1%
|
| Sysmiss | 3990 |