| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not one of the three most important sources | 29 |
29.6%
|
| 1 | First rank | 2 |
2%
|
| 2 | Second rank | 48 |
49%
|
| 3 | Third rank | 19 |
19.4%
|
| -9 | 5 | ||
| -7 | 30 |