| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1.Mandatory | 0 |
0%
|
| 2 | 2.Voluntary | 0 |
0%
|
| 6 | 6.Free | 4 |
100%
|
| 9 | 9.Missing | 0 |
0%
|
| Sysmiss | 427 |