| Value | Category | Cases | |
|---|---|---|---|
| 0 | 2622 |
92.7%
|
|
| 1 | 171 |
6%
|
|
| 888 | 1 |
0%
|
|
| 999 | 34 |
1.2%
|
|
| Sysmiss | 2001 |