| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 231 |
1.4%
|
| 2 | Twice | 41 |
0.3%
|
| 3 | Three times | 12 |
0.1%
|
| 4 | Four times | 5 |
0%
|
| 5 | More | 13 |
0.1%
|
| 6 | 15737 |
98.1%
|
|
| Sysmiss | 1513 |