| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1994 | 31 |
2.2%
|
|
| 1995 | 132 |
9.2%
|
|
| 1996 | 235 |
16.4%
|
|
| 1997 | 431 |
30.1%
|
|
| 1998 | 547 |
38.2%
|
|
| 1999 | 49 |
3.4%
|
|
| 9997 | inconsistent | 8 |
0.6%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 5012 |