| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1 | Month and year | 36 |
73.5%
|
| 5 | Year - m imp, a calc | 10 |
20.4%
|
| 7 | Month - date placed | 1 |
2%
|
| 8 | None - date placed | 2 |
4.1%
|
| Sysmiss | 3001 |