| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 192 |
36.1%
|
| 0 | 268 |
50.4%
|
|
| 5 | 1 |
0.2%
|
|
| 20 | 2 |
0.4%
|
|
| 25 | 1 |
0.2%
|
|
| 30 | 1 |
0.2%
|
|
| 40 | 2 |
0.4%
|
|
| 50 | 4 |
0.8%
|
|
| 70 | 1 |
0.2%
|
|
| 75 | 1 |
0.2%
|
|
| 80 | 1 |
0.2%
|
|
| 100 | 57 |
10.7%
|