| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 1834 | 
                                    
                                    71.6%
                                 | 
| 1 | 170 | 
                                    
                                    6.6%
                                 | |
| 2 | 67 | 
                                    
                                    2.6%
                                 | |
| 3 | 15 | 
                                    
                                    0.6%
                                 | |
| 4 | 9 | 
                                    
                                    0.4%
                                 | |
| 6 | 2 | 
                                    
                                    0.1%
                                 | |
| 7 | 1 | 
                                    
                                    0%
                                 | |
| 99 | Occasion | 465 | 
                                    
                                    18.1%
                                 | 
| Sysmiss | 205 |