| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.8%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 17 |
14.2%
|
| 0 | 60 |
50%
|
|
| 20 | 1 |
0.8%
|
|
| 50 | 3 |
2.5%
|
|
| 80 | 1 |
0.8%
|
|
| 100 | 37 |
30.8%
|