| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -96 | Other | 3 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    
| 1 | One time only | 34 | 
                                                                 
                                    
                                    18.6%
                                 
                                                             | 
                                                        
                    
| 2 | Once a month | 4 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    
| 3 | Several times a month | 4 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    
| 4 | Twice a year | 19 | 
                                                                 
                                    
                                    10.4%
                                 
                                                             | 
                                                        
                    
| 5 | Ongoing | 119 | 
                                                                 
                                    
                                    65%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 27 |