| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 | 
                                    
                                    0.9%
                                 | 
| -7 | Does not apply is a floor in a building (spontaneous) | 7 | 
                                    
                                    1%
                                 | 
| 0 | 164 | 
                                    
                                    24.2%
                                 | |
| 1 | 2 | 
                                    
                                    0.3%
                                 | |
| 5 | 1 | 
                                    
                                    0.1%
                                 | |
| 10 | 4 | 
                                    
                                    0.6%
                                 | |
| 20 | 8 | 
                                    
                                    1.2%
                                 | |
| 23 | 1 | 
                                    
                                    0.1%
                                 | |
| 25 | 3 | 
                                    
                                    0.4%
                                 | |
| 30 | 3 | 
                                    
                                    0.4%
                                 | |
| 33 | 3 | 
                                    
                                    0.4%
                                 | |
| 35 | 1 | 
                                    
                                    0.1%
                                 | |
| 40 | 4 | 
                                    
                                    0.6%
                                 | |
| 50 | 19 | 
                                    
                                    2.8%
                                 | |
| 60 | 4 | 
                                    
                                    0.6%
                                 | |
| 70 | 9 | 
                                    
                                    1.3%
                                 | |
| 73 | 1 | 
                                    
                                    0.1%
                                 | |
| 75 | 3 | 
                                    
                                    0.4%
                                 | |
| 78 | 1 | 
                                    
                                    0.1%
                                 | |
| 80 | 17 | 
                                    
                                    2.5%
                                 | |
| 85 | 2 | 
                                    
                                    0.3%
                                 | |
| 90 | 15 | 
                                    
                                    2.2%
                                 | |
| 95 | 4 | 
                                    
                                    0.6%
                                 | |
| 97 | 1 | 
                                    
                                    0.1%
                                 | |
| 98 | 1 | 
                                    
                                    0.1%
                                 | |
| 99 | 3 | 
                                    
                                    0.4%
                                 | |
| 100 | 392 | 
                                    
                                    57.7%
                                 | |
| Sysmiss | 276 |