| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 times | 1997 |
94.1%
|
| 2 | 1 or 2 times | 95 |
4.5%
|
| 3 | 3 to 9 times | 17 |
0.8%
|
| 4 | 10 or more times | 14 |
0.7%
|
| Sysmiss | 45 |