| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 4 | By mail | 3 |
7.9%
|
| 5 | By internet | 12 |
31.6%
|
| 6 | By other means (tapes, sms...) | 23 |
60.5%
|
| Sysmiss | 15574 |