| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 22184 |
95.2%
|
| 2 | Twice | 1013 |
4.3%
|
| 3 | Three times | 84 |
0.4%
|
| 4 | Four times and more | 17 |
0.1%
|
| Sysmiss | 27160 |