| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1994 | 31 |
2.3%
|
|
| 1995 | 125 |
9.1%
|
|
| 1996 | 229 |
16.7%
|
|
| 1997 | 409 |
29.9%
|
|
| 1998 | 525 |
38.3%
|
|
| 1999 | 42 |
3.1%
|
|
| 9997 | inconsistent | 8 |
0.6%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 5076 |