| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
1.5%
|
| -7 | Does not apply is a floor in a building (spontaneous) | 7 |
1.7%
|
| 0 | 106 |
25.9%
|
|
| 5 | 1 |
0.2%
|
|
| 10 | 2 |
0.5%
|
|
| 20 | 5 |
1.2%
|
|
| 23 | 1 |
0.2%
|
|
| 25 | 1 |
0.2%
|
|
| 30 | 3 |
0.7%
|
|
| 33 | 1 |
0.2%
|
|
| 40 | 3 |
0.7%
|
|
| 50 | 11 |
2.7%
|
|
| 60 | 1 |
0.2%
|
|
| 70 | 5 |
1.2%
|
|
| 73 | 1 |
0.2%
|
|
| 75 | 1 |
0.2%
|
|
| 80 | 7 |
1.7%
|
|
| 85 | 1 |
0.2%
|
|
| 90 | 8 |
2%
|
|
| 95 | 3 |
0.7%
|
|
| 97 | 1 |
0.2%
|
|
| 99 | 2 |
0.5%
|
|
| 100 | 232 |
56.7%
|