| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| -96 | Other | 6 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    
| 1 | One time only | 25 | 
                                                                 
                                    
                                    15.7%
                                 
                                                             | 
                                                        
                    
| 2 | Once a month | 10 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    
| 3 | Several times a month | 1 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 4 | Twice a year | 6 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    
| 5 | Ongoing | 111 | 
                                                                 
                                    
                                    69.8%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 51 |