| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
0.9%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 25 |
2.5%
|
| 0 | 361 |
36.2%
|
|
| 2 | 1 |
0.1%
|
|
| 8 | 1 |
0.1%
|
|
| 10 | 1 |
0.1%
|
|
| 15 | 1 |
0.1%
|
|
| 20 | 2 |
0.2%
|
|
| 30 | 1 |
0.1%
|
|
| 50 | 6 |
0.6%
|
|
| 60 | 1 |
0.1%
|
|
| 70 | 2 |
0.2%
|
|
| 80 | 1 |
0.1%
|
|
| 90 | 1 |
0.1%
|
|
| 100 | 585 |
58.6%
|