| Value | Category | Cases | |
|---|---|---|---|
| 1 | Full date known | 44 |
17.1%
|
| 2 | Day unknown | 71 |
27.5%
|
| 3 | Month unknown | 0 |
0%
|
| 4 | Day and month unknown | 124 |
48.1%
|
| 8 | Not known at all | 19 |
7.4%
|
| 9 | Missing | 0 | |
| Sysmiss | 3905 |