| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 19 |
1.3%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 81 |
5.6%
|
| 0 | 1335 |
92.3%
|
|
| 15 | 1 |
0.1%
|
|
| 20 | 2 |
0.1%
|
|
| 30 | 1 |
0.1%
|
|
| 40 | 1 |
0.1%
|
|
| 80 | 1 |
0.1%
|
|
| 85 | 1 |
0.1%
|
|
| 100 | 4 |
0.3%
|