| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.5%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 18 |
2.3%
|
| 0 | 154 |
19.9%
|
|
| 2 | 2 |
0.3%
|
|
| 10 | 7 |
0.9%
|
|
| 15 | 2 |
0.3%
|
|
| 20 | 16 |
2.1%
|
|
| 25 | 2 |
0.3%
|
|
| 30 | 6 |
0.8%
|
|
| 35 | 1 |
0.1%
|
|
| 40 | 12 |
1.6%
|
|
| 50 | 25 |
3.2%
|
|
| 55 | 1 |
0.1%
|
|
| 60 | 8 |
1%
|
|
| 70 | 5 |
0.6%
|
|
| 75 | 2 |
0.3%
|
|
| 80 | 33 |
4.3%
|
|
| 90 | 18 |
2.3%
|
|
| 93 | 1 |
0.1%
|
|
| 100 | 455 |
58.9%
|