| Value | Category | Cases | |
|---|---|---|---|
| 1 | Full date known | 57 |
78.1%
|
| 2 | Day unknown | 4 |
5.5%
|
| 4 | Day and month unknown | 4 |
5.5%
|
| 8 | Unknown | 8 |
11%
|
| 9 | Missing | 0 | |
| Sysmiss | 868 |