| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONCE | 1332 | 
                                    
                                    78.8%
                                 | 
| 2 | MORE THAN ONCE | 356 | 
                                    
                                    21.1%
                                 | 
| 9 | NO RESPONSE | 2 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 29370 |