| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 1 |
0.8%
|
| 0 | 80 |
66.7%
|
|
| 10 | 2 |
1.7%
|
|
| 30 | 2 |
1.7%
|
|
| 50 | 1 |
0.8%
|
|
| 80 | 1 |
0.8%
|
|
| 100 | 33 |
27.5%
|