| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
1.3%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 1 |
0.4%
|
| 0 | 39 |
16.7%
|
|
| 25 | 1 |
0.4%
|
|
| 30 | 1 |
0.4%
|
|
| 60 | 1 |
0.4%
|
|
| 70 | 1 |
0.4%
|
|
| 75 | 1 |
0.4%
|
|
| 100 | 185 |
79.4%
|