| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.8%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 64 |
17%
|
| 0 | 305 |
80.9%
|
|
| 100 | 5 |
1.3%
|