| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1968 | 1 |
11.1%
|
|
| 1985 | 1 |
11.1%
|
|
| 1987 | 1 |
11.1%
|
|
| 1989 | 1 |
11.1%
|
|
| 1995 | 1 |
11.1%
|
|
| 9998 | don't know | 4 |
44.4%
|
| Sysmiss | 6436 |