| Value | Category | Cases | |
|---|---|---|---|
| 1 | Full date known | 3 |
0.7%
|
| 2 | Day unknown | 6 |
1.4%
|
| 4 | Day and month unknown | 65 |
15.1%
|
| 8 | Unknown | 357 |
82.8%
|
| 9 | Missing | 0 | |
| Sysmiss | 510 |