| Value | Category | Cases | |
|---|---|---|---|
| -9 | Break off | 0 |
0%
|
| -7 | Legal skip | 51 |
4.8%
|
| -3 | Interviewer error | 0 |
0%
|
| -2 | Refuse to answer | 0 |
0%
|
| -1 | Don't know | 3 |
0.3%
|
| 1 | A major source | 282 |
26.8%
|
| 2 | A minor source | 491 |
46.6%
|
| 3 | No source at all | 226 |
21.5%
|