| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 times | 1990 |
96.3%
|
| 2 | 1 or 2 times | 47 |
2.3%
|
| 3 | 3 to 9 times | 15 |
0.7%
|
| 4 | 10 or more times | 14 |
0.7%
|
| Sysmiss | 29 |