| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.6%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 9 |
2.5%
|
| 0 | 334 |
92.8%
|
|
| 10 | 2 |
0.6%
|
|
| 30 | 1 |
0.3%
|
|
| 40 | 1 |
0.3%
|
|
| 80 | 1 |
0.3%
|
|
| 85 | 1 |
0.3%
|
|
| 98 | 1 |
0.3%
|
|
| 100 | 8 |
2.2%
|