| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    
| 2 | Every two weeks | 5 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 3 | Monthly | 978 | 
                                                                 
                                    
                                    97.2%
                                 
                                                             | 
                                                        
                    
| 4 | As often as I want | 21 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 2303 |