| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1990 | 
                                                                 
                                    
                                    96.6%
                                 
                                                             | 
                                                        
                    |
| 2 | 54 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 3 | 15 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 4 | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |