| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| -7 | Does not apply is a floor in a building (spontaneous) | 58 | 
                                                                 
                                    
                                    10%
                                 
                                                             | 
                                                        
                    
| 0 | 487 | 
                                                                 
                                    
                                    84%
                                 
                                                             | 
                                                        
                    |
| 10 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 30 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 40 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 50 | 2 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 70 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 80 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 100 | 24 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 1 |