| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1994 | 18 |
2%
|
|
| 1995 | 79 |
8.8%
|
|
| 1996 | 130 |
14.5%
|
|
| 1997 | 256 |
28.5%
|
|
| 1998 | 391 |
43.6%
|
|
| 1999 | 21 |
2.3%
|
|
| 9997 | inconsistent | 2 |
0.2%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 5548 |