| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1994 | 143 |
7.3%
|
|
| 1995 | 337 |
17.3%
|
|
| 1996 | 350 |
17.9%
|
|
| 1997 | 484 |
24.8%
|
|
| 1998 | 580 |
29.7%
|
|
| 1999 | 49 |
2.5%
|
|
| 9997 | inconsistent | 10 |
0.5%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 4000 |