| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 | 
                                    
                                    0.2%
                                 | 
| 0 | 2 | 
                                    
                                    0.3%
                                 | |
| 1 | 18 | 
                                    
                                    2.9%
                                 | |
| 2 | 58 | 
                                    
                                    9.5%
                                 | |
| 3 | 122 | 
                                    
                                    19.9%
                                 | |
| 4 | 165 | 
                                    
                                    27%
                                 | |
| 5 | 111 | 
                                    
                                    18.1%
                                 | |
| 6 | 61 | 
                                    
                                    10%
                                 | |
| 7 | 29 | 
                                    
                                    4.7%
                                 | |
| 8 | 20 | 
                                    
                                    3.3%
                                 | |
| 9 | 8 | 
                                    
                                    1.3%
                                 | |
| 10 | 10 | 
                                    
                                    1.6%
                                 | |
| 11 | 2 | 
                                    
                                    0.3%
                                 | |
| 12 | 1 | 
                                    
                                    0.2%
                                 | |
| 13 | 2 | 
                                    
                                    0.3%
                                 | |
| 14 | 1 | 
                                    
                                    0.2%
                                 | |
| 24 | 1 | 
                                    
                                    0.2%
                                 |