| Value | Category | Cases | |
|---|---|---|---|
| 1 | mandatory | 2 |
0.1%
|
| 2 | voluntary | 1 |
0%
|
| 3 | both | 0 |
0%
|
| 4 | none | 2134 |
99.9%
|
| 11 | .A | 1 | |
| Sysmiss | 4181 |