| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 times | 1223 | 
                                    
                                    93.6%
                                 | 
| 2 | 1 or 2 times | 28 | 
                                    
                                    2.1%
                                 | 
| 3 | 3 to 9 times | 25 | 
                                    
                                    1.9%
                                 | 
| 4 | 10 to 19 times | 14 | 
                                    
                                    1.1%
                                 | 
| 5 | 20 or more times | 16 | 
                                    
                                    1.2%
                                 | 
| Sysmiss | 51 |