| Value | Category | Cases | |
|---|---|---|---|
| 1 | _____ operational hour | 5 | 
                                                                 
                                    
                                    100%
                                 
                                                             | 
                                                        
                    
| 8 | 8. Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9 | 9. Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 305 |