| Value | Category | Cases | |
|---|---|---|---|
| 1 | mandatory | 3 |
0.1%
|
| 2 | voluntary | 4 |
0.1%
|
| 3 | both | 1 |
0%
|
| 4 | none | 4044 |
99.8%
|
| 11 | .A | 1 | |
| Sysmiss | 2266 |