| Value | Category | Cases | |
|---|---|---|---|
| 1 | per day | 26 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    
| 2 | per week | 15 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    
| 3 | per month | 583 | 
                                                                 
                                    
                                    93.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 129 |