| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 94 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    
| 2 | Monthly | 481 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    
| 3 | Yearly | 1645 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    
| 4 | Less often | 2308 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    
| 5 | Not at all | 20239 | 
                                                                 
                                    
                                    81.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 817 |