| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 22 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 2 | Twice | 6 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 3 | Three times | 5 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 4 | Four times | 3 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 5 | More | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 6 | Never | 3580 | 
                                                                 
                                    
                                    24.2%
                                 
                                                             | 
                                                        
                    
| 7 | Not Applicable | 11199 | 
                                                                 
                                    
                                    75.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 513 |