| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.8%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 18 |
5%
|
| 0 | 242 |
66.9%
|
|
| 5 | 1 |
0.3%
|
|
| 10 | 3 |
0.8%
|
|
| 15 | 1 |
0.3%
|
|
| 20 | 3 |
0.8%
|
|
| 30 | 2 |
0.6%
|
|
| 50 | 7 |
1.9%
|
|
| 60 | 3 |
0.8%
|
|
| 70 | 4 |
1.1%
|
|
| 75 | 1 |
0.3%
|
|
| 76 | 1 |
0.3%
|
|
| 80 | 1 |
0.3%
|
|
| 95 | 1 |
0.3%
|
|
| 100 | 71 |
19.6%
|