| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 1657 |
89.1%
|
| 5 | year - m imp, a calc | 139 |
7.5%
|
| 7 | month - date placed | 17 |
0.9%
|
| 8 | none - date placed | 47 |
2.5%
|
| 9 | from calendar | 0 |
0%
|
| Sysmiss | 2129 |