| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1967 | 1 |
3.3%
|
|
| 1977 | 1 |
3.3%
|
|
| 1979 | 1 |
3.3%
|
|
| 1986 | 1 |
3.3%
|
|
| 1989 | 1 |
3.3%
|
|
| 1993 | 1 |
3.3%
|
|
| 1995 | 2 |
6.7%
|
|
| 1997 | 2 |
6.7%
|
|
| 1998 | 3 |
10%
|
|
| 9998 | don't know | 17 |
56.7%
|
| Sysmiss | 6415 |