| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1994 | 143 |
7.7%
|
|
| 1995 | 318 |
17%
|
|
| 1996 | 335 |
17.9%
|
|
| 1997 | 465 |
24.9%
|
|
| 1998 | 554 |
29.6%
|
|
| 1999 | 43 |
2.3%
|
|
| 9997 | inconsistent | 11 |
0.6%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 4084 |