| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 361 |
91.9%
|
| 5 | year - m imp, a calc | 28 |
7.1%
|
| 7 | month - date placed | 1 |
0.3%
|
| 8 | none - date placed | 3 |
0.8%
|
| 9 | from calendar | 0 |
0%
|
| Sysmiss | 412 |