| Value | Category | Cases | |
|---|---|---|---|
| 1 | once | 323 | 
                                                                 
                                    
                                    30%
                                 
                                                             | 
                                                        
                    
| 2 | twice | 276 | 
                                                                 
                                    
                                    25.6%
                                 
                                                             | 
                                                        
                    
| 3 | 3 times or more | 479 | 
                                                                 
                                    
                                    44.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 24875 |