| Value | Category | Cases | |
|---|---|---|---|
| 1 | mandatory | 8 |
0.2%
|
| 2 | voluntary | 6 |
0.1%
|
| 3 | both | 3 |
0.1%
|
| 4 | none | 5276 |
99.7%
|
| 11 | .A | 2 | |
| Sysmiss | 1024 |