| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 | 
                                    
                                    0.4%
                                 | 
| 0 | 926 | 
                                    
                                    97%
                                 | |
| 2 | 2 | 
                                    
                                    0.2%
                                 | |
| 3 | 1 | 
                                    
                                    0.1%
                                 | |
| 5 | 1 | 
                                    
                                    0.1%
                                 | |
| 6 | 1 | 
                                    
                                    0.1%
                                 | |
| 10 | 3 | 
                                    
                                    0.3%
                                 | |
| 12 | 1 | 
                                    
                                    0.1%
                                 | |
| 20 | 1 | 
                                    
                                    0.1%
                                 | |
| 25 | 3 | 
                                    
                                    0.3%
                                 | |
| 27 | 1 | 
                                    
                                    0.1%
                                 | |
| 28 | 1 | 
                                    
                                    0.1%
                                 | |
| 35 | 1 | 
                                    
                                    0.1%
                                 | |
| 37 | 1 | 
                                    
                                    0.1%
                                 | |
| 40 | 1 | 
                                    
                                    0.1%
                                 | |
| 45 | 1 | 
                                    
                                    0.1%
                                 | |
| 49 | 2 | 
                                    
                                    0.2%
                                 | |
| 50 | 1 | 
                                    
                                    0.1%
                                 | |
| 66 | 1 | 
                                    
                                    0.1%
                                 | |
| 75 | 1 | 
                                    
                                    0.1%
                                 | |
| 95 | 1 | 
                                    
                                    0.1%
                                 |