| Value | Category | Cases | |
|---|---|---|---|
| 1 | Month and year | 628 |
94.9%
|
| 2 | From calendar | 6 |
0.9%
|
| 5 | Year | 26 |
3.9%
|
| 6 | 0 |
0%
|
|
| 7 | Month | 0 |
0%
|
| 8 | None | 2 |
0.3%
|
| Sysmiss | 5417 |