| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 1707 | 
                                                                 
                                    
                                    6.9%
                                 
                                                             | 
                                                        
                    
| 2 | Monthly | 908 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    
| 3 | Yearly | 1086 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    
| 4 | Less often | 2337 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    
| 5 | Not at all | 18729 | 
                                                                 
                                    
                                    75.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 817 |