| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 0 | Source known | 2860 | 2871 |
99.2%
|
| 1 | No source known | 22 | 22 |
0.8%
|
| 9 | 145 | 161 | ||
| Sysmiss | 3920 | 3497 |