| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 times | 1031 | 
                                    
                                    79.6%
                                 | 
| 2 | 1 or 2 times | 189 | 
                                    
                                    14.6%
                                 | 
| 3 | 3 to 9 times | 47 | 
                                    
                                    3.6%
                                 | 
| 4 | 10 or more times | 29 | 
                                    
                                    2.2%
                                 | 
| Sysmiss | 61 |