| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -96 | Other | 1 | 
                                    
                                    0.5%
                                 | 
| 1 | One time only | 1 | 
                                    
                                    0.5%
                                 | 
| 2 | Once a month | 5 | 
                                    
                                    2.6%
                                 | 
| 3 | Several times a month | 0 | 
                                    
                                    0%
                                 | 
| 4 | Twice a year | 101 | 
                                    
                                    51.5%
                                 | 
| 5 | Ongoing | 88 | 
                                    
                                    44.9%
                                 | 
| Sysmiss | 14 |