| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 149 |
24.8%
|
| 0 | 262 |
43.6%
|
|
| 5 | 4 |
0.7%
|
|
| 10 | 12 |
2%
|
|
| 15 | 8 |
1.3%
|
|
| 20 | 8 |
1.3%
|
|
| 25 | 3 |
0.5%
|
|
| 30 | 2 |
0.3%
|
|
| 40 | 1 |
0.2%
|
|
| 50 | 3 |
0.5%
|
|
| 60 | 1 |
0.2%
|
|
| 100 | 147 |
24.5%
|