| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 times | 1673 | 
                                                                 
                                    
                                    89.4%
                                 
                                                             | 
                                                        
                    
| 2 | 1 or 2 times | 160 | 
                                                                 
                                    
                                    8.5%
                                 
                                                             | 
                                                        
                    
| 3 | 3 to 9 times | 27 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    
| 4 | 10 or more times | 12 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 64 |