| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    0.3%
                                 | 
| 0 | 2 | 
                                    
                                    0.3%
                                 | |
| 1 | 96 | 
                                    
                                    15.7%
                                 | |
| 2 | 145 | 
                                    
                                    23.7%
                                 | |
| 3 | 133 | 
                                    
                                    21.7%
                                 | |
| 4 | 147 | 
                                    
                                    24%
                                 | |
| 5 | 28 | 
                                    
                                    4.6%
                                 | |
| 6 | 22 | 
                                    
                                    3.6%
                                 | |
| 7 | 15 | 
                                    
                                    2.5%
                                 | |
| 8 | 4 | 
                                    
                                    0.7%
                                 | |
| 9 | 2 | 
                                    
                                    0.3%
                                 | |
| 10 | 3 | 
                                    
                                    0.5%
                                 | |
| 11 | 1 | 
                                    
                                    0.2%
                                 | |
| 12 | 3 | 
                                    
                                    0.5%
                                 | |
| 14 | 4 | 
                                    
                                    0.7%
                                 | |
| 15 | 1 | 
                                    
                                    0.2%
                                 | |
| 17 | 1 | 
                                    
                                    0.2%
                                 | |
| 22 | 1 | 
                                    
                                    0.2%
                                 | |
| 30 | 1 | 
                                    
                                    0.2%
                                 | |
| 45 | 1 | 
                                    
                                    0.2%
                                 |