| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 1 | Weekly | 16 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    
| 2 | Monthly | 49 | 
                                                                 
                                    
                                    12.4%
                                 
                                                             | 
                                                        
                    
| 3 | A few times a year | 110 | 
                                                                 
                                    
                                    27.8%
                                 
                                                             | 
                                                        
                    
| 4 | Rarely | 78 | 
                                                                 
                                    
                                    19.7%
                                 
                                                             | 
                                                        
                    
| 5 | Never | 63 | 
                                                                 
                                    
                                    15.9%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 73 | 
                                                                 
                                    
                                    18.5%
                                 
                                                             |