| Value | Category | Cases | |
|---|---|---|---|
| a | 1315 | 
                                    
                                    66.9%
                                 | |
| ab | 310 | 
                                    
                                    15.8%
                                 | |
| abd | 11 | 
                                    
                                    0.6%
                                 | |
| ad | 40 | 
                                    
                                    2%
                                 | |
| b | 208 | 
                                    
                                    10.6%
                                 | |
| c | 22 | 
                                    
                                    1.1%
                                 | |
| d | 61 | 
                                    
                                    3.1%
                                 |