| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.8%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 0 |
0%
|
| 0 | 346 |
96.4%
|
|
| 50 | 1 |
0.3%
|
|
| 94 | 1 |
0.3%
|
|
| 100 | 8 |
2.2%
|