| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 1375 |
75.2%
|
| 2 | from calendar | 0 |
0%
|
| 5 | year | 339 |
18.5%
|
| 6 | 0 |
0%
|
|
| 7 | month | 11 |
0.6%
|
| 8 | none | 104 |
5.7%
|
| Sysmiss | 13117 |