| Value | Category | Cases | |
|---|---|---|---|
| 1 | Month and year | 8898 |
95%
|
| 5 | Year - a, m imp | 367 |
3.9%
|
| 7 | Month - a, y imp | 34 |
0.4%
|
| 8 | None - all imp | 64 |
0.7%
|
| Sysmiss | 5546 |