| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
1.3%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 4 |
1.7%
|
| 0 | 109 |
45.4%
|
|
| 20 | 1 |
0.4%
|
|
| 25 | 1 |
0.4%
|
|
| 30 | 1 |
0.4%
|
|
| 34 | 1 |
0.4%
|
|
| 50 | 9 |
3.8%
|
|
| 60 | 1 |
0.4%
|
|
| 67 | 1 |
0.4%
|
|
| 70 | 2 |
0.8%
|
|
| 75 | 1 |
0.4%
|
|
| 80 | 1 |
0.4%
|
|
| 90 | 6 |
2.5%
|
|
| 100 | 99 |
41.3%
|