| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 1973 |
99.2%
|
| 2 | Once | 4 |
0.2%
|
| 3 | More than once | 1 |
0.1%
|
| 4 | Not applicable | 5 |
0.3%
|
| Sysmiss | 5 |