| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 1489 |
85.5%
|
| 2 | More than one time | 176 |
10.1%
|
| 88 | 67 |
3.8%
|
|
| 99 | 9 |
0.5%
|
|
| Sysmiss | 258 |