| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.8%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 18 |
5%
|
| 0 | 336 |
92.8%
|
|
| 5 | 1 |
0.3%
|
|
| 65 | 1 |
0.3%
|
|
| 100 | 3 |
0.8%
|