| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1989 | 
                                    
                                    31.9%
                                 | |
| 3 | 4232 | 
                                    
                                    67.8%
                                 | |
| 8 | 19 | 
                                    
                                    0.3%
                                 | |
| Sysmiss | 5071 |